archive_read_support_format_zip.c revision 302295
155714Skris/*- 255714Skris * Copyright (c) 2004-2013 Tim Kientzle 355714Skris * Copyright (c) 2011-2012,2014 Michihiro NAKAJIMA 455714Skris * Copyright (c) 2013 Konrad Kleine 555714Skris * All rights reserved. 655714Skris * 755714Skris * Redistribution and use in source and binary forms, with or without 8280304Sjkim * modification, are permitted provided that the following conditions 955714Skris * are met: 1055714Skris * 1. Redistributions of source code must retain the above copyright 1155714Skris * notice, this list of conditions and the following disclaimer. 1255714Skris * 2. Redistributions in binary form must reproduce the above copyright 1355714Skris * notice, this list of conditions and the following disclaimer in the 1455714Skris * documentation and/or other materials provided with the distribution. 15280304Sjkim * 1655714Skris * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 1755714Skris * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1855714Skris * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 1955714Skris * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 2055714Skris * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2155714Skris * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22280304Sjkim * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2355714Skris * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2455714Skris * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2555714Skris * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2655714Skris */ 2755714Skris 2855714Skris#include "archive_platform.h" 2955714Skris__FBSDID("$FreeBSD: stable/10/contrib/libarchive/libarchive/archive_read_support_format_zip.c 302295 2016-06-30 12:44:15Z mm $"); 3055714Skris 3155714Skris/* 3255714Skris * The definitive documentation of the Zip file format is: 3355714Skris * http://www.pkware.com/documents/casestudies/APPNOTE.TXT 3455714Skris * 3555714Skris * The Info-Zip project has pioneered various extensions to better 3655714Skris * support Zip on Unix, including the 0x5455 "UT", 0x5855 "UX", 0x7855 37280304Sjkim * "Ux", and 0x7875 "ux" extensions for time and ownership 3855714Skris * information. 3955714Skris * 40280304Sjkim * History of this code: The streaming Zip reader was first added to 4155714Skris * libarchive in January 2005. Support for seekable input sources was 4255714Skris * added in Nov 2011. Zip64 support (including a significant code 4355714Skris * refactoring) was added in 2014. 4455714Skris */ 4555714Skris 4655714Skris#ifdef HAVE_ERRNO_H 4755714Skris#include <errno.h> 4855714Skris#endif 4955714Skris#ifdef HAVE_STDLIB_H 5055714Skris#include <stdlib.h> 5155714Skris#endif 52280304Sjkim#ifdef HAVE_ZLIB_H 5355714Skris#include <zlib.h> 5455714Skris#endif 5555714Skris 5655714Skris#include "archive.h" 5755714Skris#include "archive_digest_private.h" 5855714Skris#include "archive_cryptor_private.h" 59280304Sjkim#include "archive_endian.h" 60280304Sjkim#include "archive_entry.h" 61280304Sjkim#include "archive_entry_locale.h" 62280304Sjkim#include "archive_hmac_private.h" 63160814Ssimon#include "archive_private.h" 64280304Sjkim#include "archive_rb.h" 65160814Ssimon#include "archive_read_private.h" 66160814Ssimon 6755714Skris#ifndef HAVE_ZLIB_H 6855714Skris#include "archive_crc32.h" 6955714Skris#endif 7055714Skris 71109998Smarkmstruct zip_entry { 72280304Sjkim struct archive_rb_node node; 7355714Skris struct zip_entry *next; 7455714Skris int64_t local_header_offset; 7555714Skris int64_t compressed_size; 7655714Skris int64_t uncompressed_size; 7755714Skris int64_t gid; 7855714Skris int64_t uid; 7955714Skris struct archive_string rsrcname; 8055714Skris time_t mtime; 8155714Skris time_t atime; 8255714Skris time_t ctime; 8355714Skris uint32_t crc32; 84160814Ssimon uint16_t mode; 85160814Ssimon uint16_t zip_flags; /* From GP Flags Field */ 86280304Sjkim unsigned char compression; 87160814Ssimon unsigned char system; /* From "version written by" */ 88160814Ssimon unsigned char flags; /* Our extra markers. */ 89280304Sjkim unsigned char decdat;/* Used for Decryption check */ 90160814Ssimon 9155714Skris /* WinZip AES encryption extra field should be available 92280304Sjkim * when compression is 99. */ 9355714Skris struct { 94280304Sjkim /* Vendor version: AE-1 - 0x0001, AE-2 - 0x0002 */ 95280304Sjkim unsigned vendor; 96280304Sjkim#define AES_VENDOR_AE_1 0x0001 97280304Sjkim#define AES_VENDOR_AE_2 0x0002 98280304Sjkim /* AES encryption strength: 99280304Sjkim * 1 - 128 bits, 2 - 192 bits, 2 - 256 bits. */ 100280304Sjkim unsigned strength; 101280304Sjkim /* Actual compression method. */ 102280304Sjkim unsigned char compression; 10355714Skris } aes_extra; 104280304Sjkim}; 105280304Sjkim 10655714Skrisstruct trad_enc_ctx { 10755714Skris uint32_t keys[3]; 108280304Sjkim}; 10955714Skris 110280304Sjkim/* Bits used in zip_flags. */ 111280304Sjkim#define ZIP_ENCRYPTED (1 << 0) 11255714Skris#define ZIP_LENGTH_AT_END (1 << 3) 113280304Sjkim#define ZIP_STRONG_ENCRYPTED (1 << 6) 114280304Sjkim#define ZIP_UTF8_NAME (1 << 11) 115280304Sjkim/* See "7.2 Single Password Symmetric Encryption Method" 116280304Sjkim in http://www.pkware.com/documents/casestudies/APPNOTE.TXT */ 117280304Sjkim#define ZIP_CENTRAL_DIRECTORY_ENCRYPTED (1 << 13) 118280304Sjkim 119280304Sjkim/* Bits used in flags. */ 120280304Sjkim#define LA_USED_ZIP64 (1 << 0) 121280304Sjkim#define LA_FROM_CENTRAL_DIRECTORY (1 << 1) 12268651Skris 123280304Sjkim/* 124280304Sjkim * See "WinZip - AES Encryption Information" 125280304Sjkim * http://www.winzip.com/aes_info.htm 126280304Sjkim */ 127280304Sjkim/* Value used in compression method. */ 128280304Sjkim#define WINZIP_AES_ENCRYPTION 99 12955714Skris/* Authentication code size. */ 13055714Skris#define AUTH_CODE_SIZE 10 131280304Sjkim/**/ 132280304Sjkim#define MAX_DERIVED_KEY_BUF_SIZE (AES_MAX_KEY_SIZE * 2 + 2) 133160814Ssimon 134280304Sjkimstruct zip { 13559191Skris /* Structural information about the archive. */ 136280304Sjkim struct archive_string format_name; 137280304Sjkim int64_t central_directory_offset; 138280304Sjkim size_t central_directory_entries_total; 13959191Skris size_t central_directory_entries_on_this_disk; 140280304Sjkim int has_encrypted_entries; 141280304Sjkim 142160814Ssimon /* List of entries (seekable Zip only) */ 143280304Sjkim struct zip_entry *zip_entries; 144280304Sjkim struct archive_rb_tree tree; 145280304Sjkim struct archive_rb_tree tree_rsrc; 146280304Sjkim 147280304Sjkim /* Bytes read but not yet consumed via __archive_read_consume() */ 148238405Sjkim size_t unconsumed; 149280304Sjkim 150160814Ssimon /* Information about entry we're currently reading. */ 151280304Sjkim struct zip_entry *entry; 152280304Sjkim int64_t entry_bytes_remaining; 153280304Sjkim 15455714Skris /* These count the number of bytes actually read for the entry. */ 155280304Sjkim int64_t entry_compressed_bytes_read; 15655714Skris int64_t entry_uncompressed_bytes_read; 157280304Sjkim 158280304Sjkim /* Running CRC32 of the decompressed data */ 15955714Skris unsigned long entry_crc32; 16059191Skris unsigned long (*crc32func)(unsigned long, const void *, 16159191Skris size_t); 16255714Skris char ignore_crc32; 163280304Sjkim 164280304Sjkim /* Flags to mark progress of decompression. */ 165280304Sjkim char decompress_init; 166280304Sjkim char end_of_entry; 167280304Sjkim 168280304Sjkim#ifdef HAVE_ZLIB_H 169280304Sjkim unsigned char *uncompressed_buffer; 170280304Sjkim size_t uncompressed_buffer_size; 171280304Sjkim z_stream stream; 172280304Sjkim char stream_valid; 173280304Sjkim#endif 174280304Sjkim 175280304Sjkim struct archive_string_conv *sconv; 176280304Sjkim struct archive_string_conv *sconv_default; 177280304Sjkim struct archive_string_conv *sconv_utf8; 178280304Sjkim int init_default_conversion; 179280304Sjkim int process_mac_extensions; 180280304Sjkim 181280304Sjkim char init_decryption; 182111147Snectar 183280304Sjkim /* Decryption buffer. */ 184111147Snectar /* 185280304Sjkim * The decrypted data starts at decrypted_ptr and 186280304Sjkim * extends for decrypted_bytes_remaining. Decryption 187280304Sjkim * adds new data to the end of this block, data is returned 188280304Sjkim * to clients from the beginning. When the block hits the 189280304Sjkim * end of decrypted_buffer, it has to be shuffled back to 190280304Sjkim * the beginning of the buffer. 191280304Sjkim */ 192280304Sjkim unsigned char *decrypted_buffer; 193280304Sjkim unsigned char *decrypted_ptr; 194280304Sjkim size_t decrypted_buffer_size; 195280304Sjkim size_t decrypted_bytes_remaining; 196280304Sjkim size_t decrypted_unconsumed_bytes; 197280304Sjkim 19855714Skris /* Traditional PKWARE decryption. */ 199280304Sjkim struct trad_enc_ctx tctx; 200280304Sjkim char tctx_valid; 20155714Skris 20255714Skris /* WinZip AES decyption. */ 203280304Sjkim /* Contexts used for AES decryption. */ 204109998Smarkm archive_crypto_ctx cctx; 205280304Sjkim char cctx_valid; 20655714Skris archive_hmac_sha1_ctx hctx; 207280304Sjkim char hctx_valid; 20855714Skris 209280304Sjkim /* Strong encryption's decryption header information. */ 210280304Sjkim unsigned iv_size; 211280304Sjkim unsigned alg_id; 21255714Skris unsigned bit_len; 213280304Sjkim unsigned flags; 214280304Sjkim unsigned erd_size; 215280304Sjkim unsigned v_size; 216280304Sjkim unsigned v_crc32; 21755714Skris uint8_t *iv; 218280304Sjkim uint8_t *erd; 219280304Sjkim uint8_t *v_data; 220280304Sjkim}; 221280304Sjkim 222280304Sjkim/* Many systems define min or MIN, but not all. */ 223280304Sjkim#define zipmin(a,b) ((a) < (b) ? (a) : (b)) 224280304Sjkim 225280304Sjkim/* ------------------------------------------------------------------------ */ 226280304Sjkim 227280304Sjkim/* 228280304Sjkim Traditional PKWARE Decryption functions. 229280304Sjkim */ 230280304Sjkim 231111147Snectarstatic void 232280304Sjkimtrad_enc_update_keys(struct trad_enc_ctx *ctx, uint8_t c) 233280304Sjkim{ 234280304Sjkim uint8_t t; 235280304Sjkim#define CRC32(c, b) (crc32(c ^ 0xffffffffUL, &b, 1) ^ 0xffffffffUL) 236280304Sjkim 237280304Sjkim ctx->keys[0] = CRC32(ctx->keys[0], c); 238280304Sjkim ctx->keys[1] = (ctx->keys[1] + (ctx->keys[0] & 0xff)) * 134775813L + 1; 239280304Sjkim t = (ctx->keys[1] >> 24) & 0xff; 240280304Sjkim ctx->keys[2] = CRC32(ctx->keys[2], t); 241280304Sjkim#undef CRC32 242280304Sjkim} 243280304Sjkim 244280304Sjkimstatic uint8_t 245111147Snectartrad_enc_decypt_byte(struct trad_enc_ctx *ctx) 246280304Sjkim{ 247280304Sjkim unsigned temp = ctx->keys[2] | 2; 248280304Sjkim return (uint8_t)((temp * (temp ^ 1)) >> 8) & 0xff; 249280304Sjkim} 250280304Sjkim 251280304Sjkimstatic void 252280304Sjkimtrad_enc_decrypt_update(struct trad_enc_ctx *ctx, const uint8_t *in, 253280304Sjkim size_t in_len, uint8_t *out, size_t out_len) 254280304Sjkim{ 255280304Sjkim unsigned i, max; 256280304Sjkim 257280304Sjkim max = (unsigned)((in_len < out_len)? in_len: out_len); 258280304Sjkim 259280304Sjkim for (i = 0; i < max; i++) { 260280304Sjkim uint8_t t = in[i] ^ trad_enc_decypt_byte(ctx); 261280304Sjkim out[i] = t; 262280304Sjkim trad_enc_update_keys(ctx, t); 263280304Sjkim } 264280304Sjkim} 265280304Sjkim 266280304Sjkimstatic int 267280304Sjkimtrad_enc_init(struct trad_enc_ctx *ctx, const char *pw, size_t pw_len, 268280304Sjkim const uint8_t *key, size_t key_len, uint8_t *crcchk) 269280304Sjkim{ 270280304Sjkim uint8_t header[12]; 271280304Sjkim 272280304Sjkim if (key_len < 12) { 273280304Sjkim *crcchk = 0xff; 274280304Sjkim return -1; 275280304Sjkim } 276280304Sjkim 277280304Sjkim ctx->keys[0] = 305419896L; 278280304Sjkim ctx->keys[1] = 591751049L; 279280304Sjkim ctx->keys[2] = 878082192L; 280280304Sjkim 281280304Sjkim for (;pw_len; --pw_len) 282280304Sjkim trad_enc_update_keys(ctx, *pw++); 283280304Sjkim 284280304Sjkim trad_enc_decrypt_update(ctx, key, 12, header, 12); 285280304Sjkim /* Return the last byte for CRC check. */ 286280304Sjkim *crcchk = header[11]; 287280304Sjkim return 0; 288280304Sjkim} 289280304Sjkim 290280304Sjkim#if 0 291280304Sjkimstatic void 292280304Sjkimcrypt_derive_key_sha1(const void *p, int size, unsigned char *key, 293280304Sjkim int key_size) 294280304Sjkim{ 295280304Sjkim#define MD_SIZE 20 296280304Sjkim archive_sha1_ctx ctx; 297280304Sjkim unsigned char md1[MD_SIZE]; 298280304Sjkim unsigned char md2[MD_SIZE * 2]; 299280304Sjkim unsigned char mkb[64]; 300280304Sjkim int i; 301280304Sjkim 302280304Sjkim archive_sha1_init(&ctx); 303280304Sjkim archive_sha1_update(&ctx, p, size); 304280304Sjkim archive_sha1_final(&ctx, md1); 305280304Sjkim 306280304Sjkim memset(mkb, 0x36, sizeof(mkb)); 307280304Sjkim for (i = 0; i < MD_SIZE; i++) 308280304Sjkim mkb[i] ^= md1[i]; 309280304Sjkim archive_sha1_init(&ctx); 310280304Sjkim archive_sha1_update(&ctx, mkb, sizeof(mkb)); 311280304Sjkim archive_sha1_final(&ctx, md2); 312280304Sjkim 313280304Sjkim memset(mkb, 0x5C, sizeof(mkb)); 314280304Sjkim for (i = 0; i < MD_SIZE; i++) 315280304Sjkim mkb[i] ^= md1[i]; 316280304Sjkim archive_sha1_init(&ctx); 317280304Sjkim archive_sha1_update(&ctx, mkb, sizeof(mkb)); 318280304Sjkim archive_sha1_final(&ctx, md2 + MD_SIZE); 319280304Sjkim 320280304Sjkim if (key_size > 32) 321280304Sjkim key_size = 32; 322280304Sjkim memcpy(key, md2, key_size); 323280304Sjkim#undef MD_SIZE 324280304Sjkim} 325280304Sjkim#endif 326280304Sjkim 327280304Sjkim/* 328280304Sjkim * Common code for streaming or seeking modes. 329280304Sjkim * 330280304Sjkim * Includes code to read local file headers, decompress data 331280304Sjkim * from entry bodies, and common API. 332280304Sjkim */ 333280304Sjkim 334280304Sjkimstatic unsigned long 335280304Sjkimreal_crc32(unsigned long crc, const void *buff, size_t len) 336280304Sjkim{ 337280304Sjkim return crc32(crc, buff, (unsigned int)len); 338280304Sjkim} 339280304Sjkim 340280304Sjkim/* Used by "ignorecrc32" option to speed up tests. */ 341280304Sjkimstatic unsigned long 342280304Sjkimfake_crc32(unsigned long crc, const void *buff, size_t len) 343280304Sjkim{ 344280304Sjkim (void)crc; /* UNUSED */ 345280304Sjkim (void)buff; /* UNUSED */ 346280304Sjkim (void)len; /* UNUSED */ 347280304Sjkim return 0; 348280304Sjkim} 349280304Sjkim 350280304Sjkimstatic struct { 351280304Sjkim int id; 352280304Sjkim const char * name; 353280304Sjkim} compression_methods[] = { 354280304Sjkim {0, "uncompressed"}, /* The file is stored (no compression) */ 355280304Sjkim {1, "shrinking"}, /* The file is Shrunk */ 356280304Sjkim {2, "reduced-1"}, /* The file is Reduced with compression factor 1 */ 357280304Sjkim {3, "reduced-2"}, /* The file is Reduced with compression factor 2 */ 358280304Sjkim {4, "reduced-3"}, /* The file is Reduced with compression factor 3 */ 359280304Sjkim {5, "reduced-4"}, /* The file is Reduced with compression factor 4 */ 360280304Sjkim {6, "imploded"}, /* The file is Imploded */ 361280304Sjkim {7, "reserved"}, /* Reserved for Tokenizing compression algorithm */ 362280304Sjkim {8, "deflation"}, /* The file is Deflated */ 363280304Sjkim {9, "deflation-64-bit"}, /* Enhanced Deflating using Deflate64(tm) */ 364280304Sjkim {10, "ibm-terse"},/* PKWARE Data Compression Library Imploding 365280304Sjkim * (old IBM TERSE) */ 366280304Sjkim {11, "reserved"}, /* Reserved by PKWARE */ 367280304Sjkim {12, "bzip"}, /* File is compressed using BZIP2 algorithm */ 368280304Sjkim {13, "reserved"}, /* Reserved by PKWARE */ 369280304Sjkim {14, "lzma"}, /* LZMA (EFS) */ 370280304Sjkim {15, "reserved"}, /* Reserved by PKWARE */ 371280304Sjkim {16, "reserved"}, /* Reserved by PKWARE */ 372280304Sjkim {17, "reserved"}, /* Reserved by PKWARE */ 373280304Sjkim {18, "ibm-terse-new"}, /* File is compressed using IBM TERSE (new) */ 374280304Sjkim {19, "ibm-lz777"},/* IBM LZ77 z Architecture (PFS) */ 375280304Sjkim {97, "wav-pack"}, /* WavPack compressed data */ 376280304Sjkim {98, "ppmd-1"}, /* PPMd version I, Rev 1 */ 377280304Sjkim {99, "aes"} /* WinZip AES encryption */ 37855714Skris}; 379280304Sjkim 380280304Sjkimstatic const char * 381280304Sjkimcompression_name(const int compression) 382280304Sjkim{ 383280304Sjkim static const int num_compression_methods = 384280304Sjkim sizeof(compression_methods)/sizeof(compression_methods[0]); 385280304Sjkim int i=0; 386280304Sjkim 387280304Sjkim while(compression >= 0 && i < num_compression_methods) { 388280304Sjkim if (compression_methods[i].id == compression) 389280304Sjkim return compression_methods[i].name; 390280304Sjkim i++; 391280304Sjkim } 392280304Sjkim return "??"; 393111147Snectar} 394280304Sjkim 395280304Sjkim/* Convert an MSDOS-style date/time into Unix-style time. */ 396111147Snectarstatic time_t 397280304Sjkimzip_time(const char *p) 398280304Sjkim{ 399280304Sjkim int msTime, msDate; 400280304Sjkim struct tm ts; 401280304Sjkim 402280304Sjkim msTime = (0xff & (unsigned)p[0]) + 256 * (0xff & (unsigned)p[1]); 403280304Sjkim msDate = (0xff & (unsigned)p[2]) + 256 * (0xff & (unsigned)p[3]); 404280304Sjkim 405280304Sjkim memset(&ts, 0, sizeof(ts)); 406280304Sjkim ts.tm_year = ((msDate >> 9) & 0x7f) + 80; /* Years since 1900. */ 407280304Sjkim ts.tm_mon = ((msDate >> 5) & 0x0f) - 1; /* Month number. */ 408280304Sjkim ts.tm_mday = msDate & 0x1f; /* Day of month. */ 409280304Sjkim ts.tm_hour = (msTime >> 11) & 0x1f; 410280304Sjkim ts.tm_min = (msTime >> 5) & 0x3f; 411280304Sjkim ts.tm_sec = (msTime << 1) & 0x3e; 412160814Ssimon ts.tm_isdst = -1; 413280304Sjkim return mktime(&ts); 414280304Sjkim} 415160814Ssimon 416280304Sjkim/* 417280304Sjkim * The extra data is stored as a list of 418280304Sjkim * id1+size1+data1 + id2+size2+data2 ... 419280304Sjkim * triplets. id and size are 2 bytes each. 420280304Sjkim */ 421280304Sjkimstatic void 422280304Sjkimprocess_extra(const char *p, size_t extra_length, struct zip_entry* zip_entry) 423280304Sjkim{ 424280304Sjkim unsigned offset = 0; 425280304Sjkim 426280304Sjkim while (offset < extra_length - 4) { 427280304Sjkim unsigned short headerid = archive_le16dec(p + offset); 428280304Sjkim unsigned short datasize = archive_le16dec(p + offset + 2); 429280304Sjkim 430280304Sjkim offset += 4; 431280304Sjkim if (offset + datasize > extra_length) { 432280304Sjkim break; 433280304Sjkim } 434280304Sjkim#ifdef DEBUG 435280304Sjkim fprintf(stderr, "Header id 0x%04x, length %d\n", 436280304Sjkim headerid, datasize); 437280304Sjkim#endif 438280304Sjkim switch (headerid) { 439280304Sjkim case 0x0001: 440280304Sjkim /* Zip64 extended information extra field. */ 441280304Sjkim zip_entry->flags |= LA_USED_ZIP64; 442280304Sjkim if (zip_entry->uncompressed_size == 0xffffffff) { 443280304Sjkim if (datasize < 8) 444280304Sjkim break; 445280304Sjkim zip_entry->uncompressed_size = 446280304Sjkim archive_le64dec(p + offset); 447280304Sjkim offset += 8; 448280304Sjkim datasize -= 8; 449280304Sjkim } 45055714Skris if (zip_entry->compressed_size == 0xffffffff) { 451280304Sjkim if (datasize < 8) 452280304Sjkim break; 453280304Sjkim zip_entry->compressed_size = 454280304Sjkim archive_le64dec(p + offset); 455280304Sjkim offset += 8; 456280304Sjkim datasize -= 8; 457280304Sjkim } 458280304Sjkim if (zip_entry->local_header_offset == 0xffffffff) { 459280304Sjkim if (datasize < 8) 460280304Sjkim break; 461280304Sjkim zip_entry->local_header_offset = 462280304Sjkim archive_le64dec(p + offset); 463280304Sjkim offset += 8; 464280304Sjkim datasize -= 8; 465280304Sjkim } 466280304Sjkim /* archive_le32dec(p + offset) gives disk 46755714Skris * on which file starts, but we don't handle 46855714Skris * multi-volume Zip files. */ 469280304Sjkim break; 470280304Sjkim#ifdef DEBUG 47155714Skris case 0x0017: 472280304Sjkim { 473280304Sjkim /* Strong encryption field. */ 474280304Sjkim if (archive_le16dec(p + offset) == 2) { 475280304Sjkim unsigned algId = 476280304Sjkim archive_le16dec(p + offset + 2); 477280304Sjkim unsigned bitLen = 478280304Sjkim archive_le16dec(p + offset + 4); 479280304Sjkim int flags = 480280304Sjkim archive_le16dec(p + offset + 6); 481280304Sjkim fprintf(stderr, "algId=0x%04x, bitLen=%u, " 482280304Sjkim "flgas=%d\n", algId, bitLen,flags); 483160814Ssimon } 484280304Sjkim break; 485280304Sjkim } 486280304Sjkim#endif 487280304Sjkim case 0x5455: 488280304Sjkim { 489280304Sjkim /* Extended time field "UT". */ 490280304Sjkim int flags = p[offset]; 491280304Sjkim offset++; 492280304Sjkim datasize--; 49355714Skris /* Flag bits indicate which dates are present. */ 494280304Sjkim if (flags & 0x01) 495280304Sjkim { 496280304Sjkim#ifdef DEBUG 497280304Sjkim fprintf(stderr, "mtime: %lld -> %d\n", 498280304Sjkim (long long)zip_entry->mtime, 499280304Sjkim archive_le32dec(p + offset)); 500280304Sjkim#endif 501280304Sjkim if (datasize < 4) 50255714Skris break; 503280304Sjkim zip_entry->mtime = archive_le32dec(p + offset); 504280304Sjkim offset += 4; 505280304Sjkim datasize -= 4; 506280304Sjkim } 507280304Sjkim if (flags & 0x02) 508280304Sjkim { 509280304Sjkim if (datasize < 4) 510280304Sjkim break; 511280304Sjkim zip_entry->atime = archive_le32dec(p + offset); 512280304Sjkim offset += 4; 513280304Sjkim datasize -= 4; 514280304Sjkim } 515280304Sjkim if (flags & 0x04) 516280304Sjkim { 51755714Skris if (datasize < 4) 518280304Sjkim break; 519280304Sjkim zip_entry->ctime = archive_le32dec(p + offset); 520280304Sjkim offset += 4; 521280304Sjkim datasize -= 4; 522280304Sjkim } 523280304Sjkim break; 524280304Sjkim } 525280304Sjkim case 0x5855: 526280304Sjkim { 52755714Skris /* Info-ZIP Unix Extra Field (old version) "UX". */ 528280304Sjkim if (datasize >= 8) { 529280304Sjkim zip_entry->atime = archive_le32dec(p + offset); 530280304Sjkim zip_entry->mtime = 531280304Sjkim archive_le32dec(p + offset + 4); 532280304Sjkim } 533280304Sjkim if (datasize >= 12) { 534280304Sjkim zip_entry->uid = 535280304Sjkim archive_le16dec(p + offset + 8); 536280304Sjkim zip_entry->gid = 537280304Sjkim archive_le16dec(p + offset + 10); 538280304Sjkim } 539280304Sjkim break; 540280304Sjkim } 541280304Sjkim case 0x6c78: 542280304Sjkim { 543280304Sjkim /* Experimental 'xl' field */ 54455714Skris /* 545280304Sjkim * Introduced Dec 2013 to provide a way to 546280304Sjkim * include external file attributes (and other 547280304Sjkim * fields that ordinarily appear only in 548280304Sjkim * central directory) in local file header. 549280304Sjkim * This provides file type and permission 55059191Skris * information necessary to support full 551280304Sjkim * streaming extraction. Currently being 552280304Sjkim * discussed with other Zip developers 553280304Sjkim * ... subject to change. 554280304Sjkim * 555280304Sjkim * Format: 55659191Skris * The field starts with a bitmap that specifies 557280304Sjkim * which additional fields are included. The 558280304Sjkim * bitmap is variable length and can be extended in 559280304Sjkim * the future. 56059191Skris * 561280304Sjkim * n bytes - feature bitmap: first byte has low-order 562280304Sjkim * 7 bits. If high-order bit is set, a subsequent 563280304Sjkim * byte holds the next 7 bits, etc. 564280304Sjkim * 565109998Smarkm * if bitmap & 1, 2 byte "version made by" 566280304Sjkim * if bitmap & 2, 2 byte "internal file attributes" 567280304Sjkim * if bitmap & 4, 4 byte "external file attributes" 568280304Sjkim * if bitmap & 8, 2 byte comment length + n byte comment 569280304Sjkim */ 570280304Sjkim int bitmap, bitmap_last; 571280304Sjkim 572280304Sjkim if (datasize < 1) 573109998Smarkm break; 574280304Sjkim bitmap_last = bitmap = 0xff & p[offset]; 575280304Sjkim offset += 1; 576280304Sjkim datasize -= 1; 577280304Sjkim 578280304Sjkim /* We only support first 7 bits of bitmap; skip rest. */ 579280304Sjkim while ((bitmap_last & 0x80) != 0 580280304Sjkim && datasize >= 1) { 581280304Sjkim bitmap_last = p[offset]; 582280304Sjkim offset += 1; 583280304Sjkim datasize -= 1; 584280304Sjkim } 585280304Sjkim 586280304Sjkim if (bitmap & 1) { 587280304Sjkim /* 2 byte "version made by" */ 588280304Sjkim if (datasize < 2) 589280304Sjkim break; 590280304Sjkim zip_entry->system 59159191Skris = archive_le16dec(p + offset) >> 8; 592280304Sjkim offset += 2; 593280304Sjkim datasize -= 2; 594280304Sjkim } 595280304Sjkim if (bitmap & 2) { 59655714Skris /* 2 byte "internal file attributes" */ 597111147Snectar uint32_t internal_attributes; 598280304Sjkim if (datasize < 2) 599111147Snectar break; 600109998Smarkm internal_attributes 601280304Sjkim = archive_le16dec(p + offset); 602280304Sjkim /* Not used by libarchive at present. */ 603280304Sjkim (void)internal_attributes; /* UNUSED */ 604280304Sjkim offset += 2; 605280304Sjkim datasize -= 2; 606280304Sjkim } 607280304Sjkim if (bitmap & 4) { 608280304Sjkim /* 4 byte "external file attributes" */ 609280304Sjkim uint32_t external_attributes; 610280304Sjkim if (datasize < 4) 611280304Sjkim break; 612280304Sjkim external_attributes 613280304Sjkim = archive_le32dec(p + offset); 614280304Sjkim if (zip_entry->system == 3) { 615280304Sjkim zip_entry->mode 61655714Skris = external_attributes >> 16; 617280304Sjkim } else if (zip_entry->system == 0) { 618280304Sjkim // Interpret MSDOS directory bit 619280304Sjkim if (0x10 == (external_attributes & 0x10)) { 620280304Sjkim zip_entry->mode = AE_IFDIR | 0775; 621280304Sjkim } else { 622280304Sjkim zip_entry->mode = AE_IFREG | 0664; 623280304Sjkim } 624238405Sjkim if (0x01 == (external_attributes & 0x01)) { 625280304Sjkim // Read-only bit; strip write permissions 626280304Sjkim zip_entry->mode &= 0555; 627280304Sjkim } 628264331Sjkim } else { 629280304Sjkim zip_entry->mode = 0; 630280304Sjkim } 631280304Sjkim offset += 4; 632280304Sjkim datasize -= 4; 633280304Sjkim } 634280304Sjkim if (bitmap & 8) { 63555714Skris /* 2 byte comment length + comment */ 636280304Sjkim uint32_t comment_length; 637280304Sjkim if (datasize < 2) 638280304Sjkim break; 639280304Sjkim comment_length 640280304Sjkim = archive_le16dec(p + offset); 641280304Sjkim offset += 2; 642280304Sjkim datasize -= 2; 64355714Skris 644280304Sjkim if (datasize < comment_length) 645280304Sjkim break; 646280304Sjkim /* Comment is not supported by libarchive */ 647280304Sjkim offset += comment_length; 648280304Sjkim datasize -= comment_length; 649280304Sjkim } 650238405Sjkim break; 651280304Sjkim } 652280304Sjkim case 0x7855: 653280304Sjkim /* Info-ZIP Unix Extra Field (type 2) "Ux". */ 654280304Sjkim#ifdef DEBUG 655280304Sjkim fprintf(stderr, "uid %d gid %d\n", 656280304Sjkim archive_le16dec(p + offset), 657280304Sjkim archive_le16dec(p + offset + 2)); 658280304Sjkim#endif 659280304Sjkim if (datasize >= 2) 660280304Sjkim zip_entry->uid = archive_le16dec(p + offset); 661280304Sjkim if (datasize >= 4) 662238405Sjkim zip_entry->gid = 663280304Sjkim archive_le16dec(p + offset + 2); 664280304Sjkim break; 665238405Sjkim case 0x7875: 666280304Sjkim { 667280304Sjkim /* Info-Zip Unix Extra Field (type 3) "ux". */ 66855714Skris int uidsize = 0, gidsize = 0; 669280304Sjkim 670280304Sjkim /* TODO: support arbitrary uidsize/gidsize. */ 671280304Sjkim if (datasize >= 1 && p[offset] == 1) {/* version=1 */ 672280304Sjkim if (datasize >= 4) { 673238405Sjkim /* get a uid size. */ 674280304Sjkim uidsize = 0xff & (int)p[offset+1]; 675280304Sjkim if (uidsize == 2) 67655714Skris zip_entry->uid = 677280304Sjkim archive_le16dec( 678280304Sjkim p + offset + 2); 679280304Sjkim else if (uidsize == 4 && datasize >= 6) 680280304Sjkim zip_entry->uid = 681280304Sjkim archive_le32dec( 682280304Sjkim p + offset + 2); 683280304Sjkim } 684280304Sjkim if (datasize >= (2 + uidsize + 3)) { 685280304Sjkim /* get a gid size. */ 686280304Sjkim gidsize = 0xff & (int)p[offset+2+uidsize]; 687280304Sjkim if (gidsize == 2) 688109998Smarkm zip_entry->gid = 689280304Sjkim archive_le16dec( 690280304Sjkim p+offset+2+uidsize+1); 691280304Sjkim else if (gidsize == 4 && 692280304Sjkim datasize >= (2 + uidsize + 5)) 69368651Skris zip_entry->gid = 694280304Sjkim archive_le32dec( 695280304Sjkim p+offset+2+uidsize+1); 696280304Sjkim } 697280304Sjkim } 698280304Sjkim break; 699280304Sjkim } 700280304Sjkim case 0x9901: 70155714Skris /* WinZIp AES extra data field. */ 702280304Sjkim if (p[offset + 2] == 'A' && p[offset + 3] == 'E') { 703280304Sjkim /* Vendor version. */ 704280304Sjkim zip_entry->aes_extra.vendor = 705280304Sjkim archive_le16dec(p + offset); 706280304Sjkim /* AES encryption strength. */ 707280304Sjkim zip_entry->aes_extra.strength = p[offset + 4]; 708280304Sjkim /* Actual compression method. */ 709280304Sjkim zip_entry->aes_extra.compression = 710280304Sjkim p[offset + 5]; 711280304Sjkim } 712280304Sjkim break; 71355714Skris default: 714280304Sjkim break; 715280304Sjkim } 716280304Sjkim offset += datasize; 717280304Sjkim } 718280304Sjkim#ifdef DEBUG 719280304Sjkim if (offset != extra_length) 720280304Sjkim { 721280304Sjkim fprintf(stderr, 722280304Sjkim "Extra data field contents do not match reported size!\n"); 723280304Sjkim } 724280304Sjkim#endif 725280304Sjkim} 726280304Sjkim 727280304Sjkim/* 72855714Skris * Assumes file pointer is at beginning of local file header. 729280304Sjkim */ 730280304Sjkimstatic int 731280304Sjkimzip_read_local_file_header(struct archive_read *a, struct archive_entry *entry, 732280304Sjkim struct zip *zip) 733280304Sjkim{ 734280304Sjkim const char *p; 735280304Sjkim const void *h; 736280304Sjkim const wchar_t *wp; 737280304Sjkim const char *cp; 738280304Sjkim size_t len, filename_length, extra_length; 739280304Sjkim struct archive_string_conv *sconv; 740280304Sjkim struct zip_entry *zip_entry = zip->entry; 741280304Sjkim struct zip_entry zip_entry_central_dir; 742280304Sjkim int ret = ARCHIVE_OK; 74355714Skris char version; 744280304Sjkim 745280304Sjkim /* Save a copy of the original for consistency checks. */ 746280304Sjkim zip_entry_central_dir = *zip_entry; 747280304Sjkim 748280304Sjkim zip->decompress_init = 0; 749280304Sjkim zip->end_of_entry = 0; 750280304Sjkim zip->entry_uncompressed_bytes_read = 0; 751280304Sjkim zip->entry_compressed_bytes_read = 0; 752280304Sjkim zip->entry_crc32 = zip->crc32func(0, NULL, 0); 753280304Sjkim 754280304Sjkim /* Setup default conversion. */ 755280304Sjkim if (zip->sconv == NULL && !zip->init_default_conversion) { 756280304Sjkim zip->sconv_default = 757280304Sjkim archive_string_default_conversion_for_read(&(a->archive)); 758238405Sjkim zip->init_default_conversion = 1; 759280304Sjkim } 760280304Sjkim 761280304Sjkim if ((p = __archive_read_ahead(a, 30, NULL)) == NULL) { 762280304Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 763280304Sjkim "Truncated ZIP file header"); 76455714Skris return (ARCHIVE_FATAL); 765280304Sjkim } 766280304Sjkim 767280304Sjkim if (memcmp(p, "PK\003\004", 4) != 0) { 768280304Sjkim archive_set_error(&a->archive, -1, "Damaged Zip archive"); 769280304Sjkim return ARCHIVE_FATAL; 77055714Skris } 771280304Sjkim version = p[4]; 772280304Sjkim zip_entry->system = p[5]; 773280304Sjkim zip_entry->zip_flags = archive_le16dec(p + 6); 774280304Sjkim if (zip_entry->zip_flags & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)) { 775280304Sjkim zip->has_encrypted_entries = 1; 776280304Sjkim archive_entry_set_is_data_encrypted(entry, 1); 777280304Sjkim if (zip_entry->zip_flags & ZIP_CENTRAL_DIRECTORY_ENCRYPTED && 778280304Sjkim zip_entry->zip_flags & ZIP_ENCRYPTED && 779280304Sjkim zip_entry->zip_flags & ZIP_STRONG_ENCRYPTED) { 780280304Sjkim archive_entry_set_is_metadata_encrypted(entry, 1); 781280304Sjkim return ARCHIVE_FATAL; 782280304Sjkim } 783280304Sjkim } 784280304Sjkim zip->init_decryption = (zip_entry->zip_flags & ZIP_ENCRYPTED); 785280304Sjkim zip_entry->compression = (char)archive_le16dec(p + 8); 786280304Sjkim zip_entry->mtime = zip_time(p + 10); 787280304Sjkim zip_entry->crc32 = archive_le32dec(p + 14); 78855714Skris if (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 789280304Sjkim zip_entry->decdat = p[11]; 790280304Sjkim else 791280304Sjkim zip_entry->decdat = p[17]; 792280304Sjkim zip_entry->compressed_size = archive_le32dec(p + 18); 793280304Sjkim zip_entry->uncompressed_size = archive_le32dec(p + 22); 794280304Sjkim filename_length = archive_le16dec(p + 26); 795280304Sjkim extra_length = archive_le16dec(p + 28); 796280304Sjkim 797280304Sjkim __archive_read_consume(a, 30); 798280304Sjkim 79955714Skris /* Read the filename. */ 800280304Sjkim if ((h = __archive_read_ahead(a, filename_length, NULL)) == NULL) { 801280304Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 802280304Sjkim "Truncated ZIP file header"); 803280304Sjkim return (ARCHIVE_FATAL); 804280304Sjkim } 805280304Sjkim if (zip_entry->zip_flags & ZIP_UTF8_NAME) { 806280304Sjkim /* The filename is stored to be UTF-8. */ 807280304Sjkim if (zip->sconv_utf8 == NULL) { 808280304Sjkim zip->sconv_utf8 = 809280304Sjkim archive_string_conversion_from_charset( 810280304Sjkim &a->archive, "UTF-8", 1); 811280304Sjkim if (zip->sconv_utf8 == NULL) 812280304Sjkim return (ARCHIVE_FATAL); 81355714Skris } 814280304Sjkim sconv = zip->sconv_utf8; 81555714Skris } else if (zip->sconv != NULL) 816280304Sjkim sconv = zip->sconv; 817280304Sjkim else 818238405Sjkim sconv = zip->sconv_default; 819280304Sjkim 820280304Sjkim if (archive_entry_copy_pathname_l(entry, 821280304Sjkim h, filename_length, sconv) != 0) { 822280304Sjkim if (errno == ENOMEM) { 823280304Sjkim archive_set_error(&a->archive, ENOMEM, 824280304Sjkim "Can't allocate memory for Pathname"); 825280304Sjkim return (ARCHIVE_FATAL); 826280304Sjkim } 82759191Skris archive_set_error(&a->archive, 828280304Sjkim ARCHIVE_ERRNO_FILE_FORMAT, 829280304Sjkim "Pathname cannot be converted " 830280304Sjkim "from %s to current locale.", 831280304Sjkim archive_string_conversion_charset_name(sconv)); 832280304Sjkim ret = ARCHIVE_WARN; 833280304Sjkim } 834280304Sjkim __archive_read_consume(a, filename_length); 83559191Skris 836280304Sjkim /* Read the extra data. */ 83759191Skris if ((h = __archive_read_ahead(a, extra_length, NULL)) == NULL) { 838280304Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 839280304Sjkim "Truncated ZIP file header"); 84055714Skris return (ARCHIVE_FATAL); 841280304Sjkim } 842280304Sjkim 843280304Sjkim process_extra(h, extra_length, zip_entry); 844280304Sjkim __archive_read_consume(a, extra_length); 845280304Sjkim 846280304Sjkim /* Work around a bug in Info-Zip: When reading from a pipe, it 847280304Sjkim * stats the pipe instead of synthesizing a file entry. */ 848280304Sjkim if ((zip_entry->mode & AE_IFMT) == AE_IFIFO) { 849280304Sjkim zip_entry->mode &= ~ AE_IFMT; 850280304Sjkim zip_entry->mode |= AE_IFREG; 851280304Sjkim } 852280304Sjkim 853280304Sjkim if ((zip_entry->mode & AE_IFMT) == 0) { 854280304Sjkim /* Especially in streaming mode, we can end up 855280304Sjkim here without having seen proper mode information. 856109998Smarkm Guess from the filename. */ 857280304Sjkim wp = archive_entry_pathname_w(entry); 858280304Sjkim if (wp != NULL) { 859280304Sjkim len = wcslen(wp); 860280304Sjkim if (len > 0 && wp[len - 1] == L'/') 861109998Smarkm zip_entry->mode |= AE_IFDIR; 862280304Sjkim else 863280304Sjkim zip_entry->mode |= AE_IFREG; 864280304Sjkim } else { 865280304Sjkim cp = archive_entry_pathname(entry); 866280304Sjkim len = (cp != NULL)?strlen(cp):0; 867280304Sjkim if (len > 0 && cp[len - 1] == '/') 868109998Smarkm zip_entry->mode |= AE_IFDIR; 869280304Sjkim else 870280304Sjkim zip_entry->mode |= AE_IFREG; 871280304Sjkim } 872280304Sjkim if (zip_entry->mode == AE_IFDIR) { 873280304Sjkim zip_entry->mode |= 0775; 874109998Smarkm } else if (zip_entry->mode == AE_IFREG) { 875280304Sjkim zip_entry->mode |= 0664; 876109998Smarkm } 877280304Sjkim } 878280304Sjkim 879280304Sjkim /* Make sure directories end in '/' */ 880280304Sjkim if ((zip_entry->mode & AE_IFMT) == AE_IFDIR) { 881280304Sjkim wp = archive_entry_pathname_w(entry); 88255714Skris if (wp != NULL) { 883280304Sjkim len = wcslen(wp); 884280304Sjkim if (len > 0 && wp[len - 1] != L'/') { 88555714Skris struct archive_wstring s; 886280304Sjkim archive_string_init(&s); 887280304Sjkim archive_wstrcat(&s, wp); 888280304Sjkim archive_wstrappend_wchar(&s, L'/'); 889280304Sjkim archive_entry_copy_pathname_w(entry, s.s); 890280304Sjkim } 891280304Sjkim } else { 89255714Skris cp = archive_entry_pathname(entry); 893280304Sjkim len = (cp != NULL)?strlen(cp):0; 894280304Sjkim if (len > 0 && cp[len - 1] != '/') { 895280304Sjkim struct archive_string s; 896280304Sjkim archive_string_init(&s); 897280304Sjkim archive_strcat(&s, cp); 89855714Skris archive_strappend_char(&s, '/'); 899280304Sjkim archive_entry_set_pathname(entry, s.s); 900280304Sjkim } 901280304Sjkim } 902280304Sjkim } 903280304Sjkim 904280304Sjkim if (zip_entry->flags & LA_FROM_CENTRAL_DIRECTORY) { 905280304Sjkim /* If this came from the central dir, it's size info 906280304Sjkim * is definitive, so ignore the length-at-end flag. */ 90755714Skris zip_entry->zip_flags &= ~ZIP_LENGTH_AT_END; 908280304Sjkim /* If local header is missing a value, use the one from 909280304Sjkim the central directory. If both have it, warn about 910280304Sjkim mismatches. */ 911280304Sjkim if (zip_entry->crc32 == 0) { 912280304Sjkim zip_entry->crc32 = zip_entry_central_dir.crc32; 913280304Sjkim } else if (!zip->ignore_crc32 914280304Sjkim && zip_entry->crc32 != zip_entry_central_dir.crc32) { 915109998Smarkm archive_set_error(&a->archive, 916280304Sjkim ARCHIVE_ERRNO_FILE_FORMAT, 917280304Sjkim "Inconsistent CRC32 values"); 918280304Sjkim ret = ARCHIVE_WARN; 919280304Sjkim } 92068651Skris if (zip_entry->compressed_size == 0) { 921280304Sjkim zip_entry->compressed_size 922280304Sjkim = zip_entry_central_dir.compressed_size; 923280304Sjkim } else if (zip_entry->compressed_size 924280304Sjkim != zip_entry_central_dir.compressed_size) { 925280304Sjkim archive_set_error(&a->archive, 926280304Sjkim ARCHIVE_ERRNO_FILE_FORMAT, 927280304Sjkim "Inconsistent compressed size: " 928280304Sjkim "%jd in central directory, %jd in local header", 929280304Sjkim (intmax_t)zip_entry_central_dir.compressed_size, 930280304Sjkim (intmax_t)zip_entry->compressed_size); 93155714Skris ret = ARCHIVE_WARN; 932280304Sjkim } 933280304Sjkim if (zip_entry->uncompressed_size == 0) { 934280304Sjkim zip_entry->uncompressed_size 935280304Sjkim = zip_entry_central_dir.uncompressed_size; 936280304Sjkim } else if (zip_entry->uncompressed_size 937280304Sjkim != zip_entry_central_dir.uncompressed_size) { 938280304Sjkim archive_set_error(&a->archive, 939280304Sjkim ARCHIVE_ERRNO_FILE_FORMAT, 940280304Sjkim "Inconsistent uncompressed size: " 941280304Sjkim "%jd in central directory, %jd in local header", 942280304Sjkim (intmax_t)zip_entry_central_dir.uncompressed_size, 943109998Smarkm (intmax_t)zip_entry->uncompressed_size); 944280304Sjkim ret = ARCHIVE_WARN; 945280304Sjkim } 946280304Sjkim } 947280304Sjkim 948280304Sjkim /* Populate some additional entry fields: */ 949280304Sjkim archive_entry_set_mode(entry, zip_entry->mode); 95055714Skris archive_entry_set_uid(entry, zip_entry->uid); 951280304Sjkim archive_entry_set_gid(entry, zip_entry->gid); 952280304Sjkim archive_entry_set_mtime(entry, zip_entry->mtime, 0); 953280304Sjkim archive_entry_set_ctime(entry, zip_entry->ctime, 0); 954280304Sjkim archive_entry_set_atime(entry, zip_entry->atime, 0); 955280304Sjkim 956280304Sjkim if ((zip->entry->mode & AE_IFMT) == AE_IFLNK) { 957280304Sjkim size_t linkname_length; 958280304Sjkim 959109998Smarkm if (zip_entry->compressed_size > 64 * 1024) { 960280304Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 961280304Sjkim "Zip file with oversized link entry"); 96255714Skris return ARCHIVE_FATAL; 963280304Sjkim } 964280304Sjkim 965280304Sjkim linkname_length = (size_t)zip_entry->compressed_size; 966280304Sjkim 967280304Sjkim archive_entry_set_size(entry, 0); 968280304Sjkim p = __archive_read_ahead(a, linkname_length, NULL); 969280304Sjkim if (p == NULL) { 970280304Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 971280304Sjkim "Truncated Zip file"); 972109998Smarkm return ARCHIVE_FATAL; 973280304Sjkim } 974280304Sjkim 975280304Sjkim sconv = zip->sconv; 97655714Skris if (sconv == NULL && (zip->entry->zip_flags & ZIP_UTF8_NAME)) 977280304Sjkim sconv = zip->sconv_utf8; 978280304Sjkim if (sconv == NULL) 979280304Sjkim sconv = zip->sconv_default; 980280304Sjkim if (archive_entry_copy_symlink_l(entry, p, linkname_length, 98155714Skris sconv) != 0) { 982280304Sjkim if (errno != ENOMEM && sconv == zip->sconv_utf8 && 983280304Sjkim (zip->entry->zip_flags & ZIP_UTF8_NAME)) 984280304Sjkim archive_entry_copy_symlink_l(entry, p, 985280304Sjkim linkname_length, NULL); 986280304Sjkim if (errno == ENOMEM) { 987280304Sjkim archive_set_error(&a->archive, ENOMEM, 988280304Sjkim "Can't allocate memory for Symlink"); 989280304Sjkim return (ARCHIVE_FATAL); 990280304Sjkim } 991280304Sjkim /* 992280304Sjkim * Since there is no character-set regulation for 993280304Sjkim * symlink name, do not report the conversion error 994280304Sjkim * in an automatic conversion. 995280304Sjkim */ 996280304Sjkim if (sconv != zip->sconv_utf8 || 997280304Sjkim (zip->entry->zip_flags & ZIP_UTF8_NAME) == 0) { 998280304Sjkim archive_set_error(&a->archive, 999280304Sjkim ARCHIVE_ERRNO_FILE_FORMAT, 1000280304Sjkim "Symlink cannot be converted " 1001280304Sjkim "from %s to current locale.", 1002280304Sjkim archive_string_conversion_charset_name( 1003280304Sjkim sconv)); 1004280304Sjkim ret = ARCHIVE_WARN; 1005280304Sjkim } 1006280304Sjkim } 1007280304Sjkim zip_entry->uncompressed_size = zip_entry->compressed_size = 0; 1008280304Sjkim 1009280304Sjkim if (__archive_read_consume(a, linkname_length) < 0) { 1010280304Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1011280304Sjkim "Read error skipping symlink target name"); 1012280304Sjkim return ARCHIVE_FATAL; 1013280304Sjkim } 1014280304Sjkim } else if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 1015109998Smarkm || zip_entry->uncompressed_size > 0) { 1016280304Sjkim /* Set the size only if it's meaningful. */ 1017280304Sjkim archive_entry_set_size(entry, zip_entry->uncompressed_size); 1018109998Smarkm } 1019280304Sjkim zip->entry_bytes_remaining = zip_entry->compressed_size; 1020280304Sjkim 1021280304Sjkim /* If there's no body, force read_data() to return EOF immediately. */ 1022280304Sjkim if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 1023280304Sjkim && zip->entry_bytes_remaining < 1) 1024280304Sjkim zip->end_of_entry = 1; 1025280304Sjkim 1026280304Sjkim /* Set up a more descriptive format name. */ 1027280304Sjkim archive_string_sprintf(&zip->format_name, "ZIP %d.%d (%s)", 1028280304Sjkim version / 10, version % 10, 1029280304Sjkim compression_name(zip->entry->compression)); 1030280304Sjkim a->archive.archive_format_name = zip->format_name.s; 1031280304Sjkim 1032280304Sjkim return (ret); 1033238405Sjkim} 1034280304Sjkim 1035280304Sjkimstatic int 1036238405Sjkimcheck_authentication_code(struct archive_read *a, const void *_p) 1037280304Sjkim{ 1038280304Sjkim struct zip *zip = (struct zip *)(a->format->data); 1039280304Sjkim 1040280304Sjkim /* Check authentication code. */ 1041280304Sjkim if (zip->hctx_valid) { 1042280304Sjkim const void *p; 1043280304Sjkim uint8_t hmac[20]; 1044280304Sjkim size_t hmac_len = 20; 1045280304Sjkim int cmp; 1046280304Sjkim 1047280304Sjkim archive_hmac_sha1_final(&zip->hctx, hmac, &hmac_len); 1048280304Sjkim if (_p == NULL) { 1049280304Sjkim /* Read authentication code. */ 105055714Skris p = __archive_read_ahead(a, AUTH_CODE_SIZE, NULL); 1051160814Ssimon if (p == NULL) { 1052280304Sjkim archive_set_error(&a->archive, 1053280304Sjkim ARCHIVE_ERRNO_FILE_FORMAT, 1054280304Sjkim "Truncated ZIP file data"); 1055280304Sjkim return (ARCHIVE_FATAL); 1056280304Sjkim } 1057280304Sjkim } else { 105859191Skris p = _p; 1059280304Sjkim } 1060280304Sjkim cmp = memcmp(hmac, p, AUTH_CODE_SIZE); 1061280304Sjkim __archive_read_consume(a, AUTH_CODE_SIZE); 1062280304Sjkim if (cmp != 0) { 1063280304Sjkim archive_set_error(&a->archive, 106459191Skris ARCHIVE_ERRNO_MISC, 1065280304Sjkim "ZIP bad Authentication code"); 1066280304Sjkim return (ARCHIVE_WARN); 1067280304Sjkim } 1068280304Sjkim } 1069280304Sjkim return (ARCHIVE_OK); 1070280304Sjkim} 1071280304Sjkim 1072280304Sjkim/* 1073280304Sjkim * Read "uncompressed" data. There are three cases: 1074280304Sjkim * 1) We know the size of the data. This is always true for the 1075280304Sjkim * seeking reader (we've examined the Central Directory already). 107655714Skris * 2) ZIP_LENGTH_AT_END was set, but only the CRC was deferred. 1077280304Sjkim * Info-ZIP seems to do this; we know the size but have to grab 1078280304Sjkim * the CRC from the data descriptor afterwards. 1079280304Sjkim * 3) We're streaming and ZIP_LENGTH_AT_END was specified and 1080280304Sjkim * we have no size information. In this case, we can do pretty 1081280304Sjkim * well by watching for the data descriptor record. The data 1082280304Sjkim * descriptor is 16 bytes and includes a computed CRC that should 1083280304Sjkim * provide a strong check. 1084280304Sjkim * 1085280304Sjkim * TODO: Technically, the PK\007\010 signature is optional. 1086280304Sjkim * In the original spec, the data descriptor contained CRC 1087280304Sjkim * and size fields but had no leading signature. In practice, 108855714Skris * newer writers seem to provide the signature pretty consistently. 1089280304Sjkim * 1090280304Sjkim * For uncompressed data, the PK\007\010 marker seems essential 1091280304Sjkim * to be sure we've actually seen the end of the entry. 109255714Skris * 1093280304Sjkim * Returns ARCHIVE_OK if successful, ARCHIVE_FATAL otherwise, sets 1094280304Sjkim * zip->end_of_entry if it consumes all of the data. 1095280304Sjkim */ 1096280304Sjkimstatic int 1097280304Sjkimzip_read_data_none(struct archive_read *a, const void **_buff, 1098280304Sjkim size_t *size, int64_t *offset) 1099280304Sjkim{ 1100280304Sjkim struct zip *zip; 1101280304Sjkim const char *buff; 1102280304Sjkim ssize_t bytes_avail; 1103280304Sjkim int r; 110459191Skris 1105280304Sjkim (void)offset; /* UNUSED */ 1106280304Sjkim 110759191Skris zip = (struct zip *)(a->format->data); 1108280304Sjkim 1109280304Sjkim if (zip->entry->zip_flags & ZIP_LENGTH_AT_END) { 1110280304Sjkim const char *p; 1111280304Sjkim ssize_t grabbing_bytes = 24; 111259191Skris 1113109998Smarkm if (zip->hctx_valid) 1114109998Smarkm grabbing_bytes += AUTH_CODE_SIZE; 1115109998Smarkm /* Grab at least 24 bytes. */ 1116109998Smarkm buff = __archive_read_ahead(a, grabbing_bytes, &bytes_avail); 1117280304Sjkim if (bytes_avail < grabbing_bytes) { 1118280304Sjkim /* Zip archives have end-of-archive markers 1119280304Sjkim that are longer than this, so a failure to get at 1120280304Sjkim least 24 bytes really does indicate a truncated 112159191Skris file. */ 1122280304Sjkim archive_set_error(&a->archive, 1123280304Sjkim ARCHIVE_ERRNO_FILE_FORMAT, 1124109998Smarkm "Truncated ZIP file data"); 1125280304Sjkim return (ARCHIVE_FATAL); 1126280304Sjkim } 1127280304Sjkim /* Check for a complete PK\007\010 signature, followed 1128280304Sjkim * by the correct 4-byte CRC. */ 1129280304Sjkim p = buff; 1130280304Sjkim if (zip->hctx_valid) 1131109998Smarkm p += AUTH_CODE_SIZE; 1132109998Smarkm if (p[0] == 'P' && p[1] == 'K' 113359191Skris && p[2] == '\007' && p[3] == '\010' 1134280304Sjkim && (archive_le32dec(p + 4) == zip->entry_crc32 1135280304Sjkim || zip->ignore_crc32 1136280304Sjkim || (zip->hctx_valid 1137280304Sjkim && zip->entry->aes_extra.vendor == AES_VENDOR_AE_2))) { 1138280304Sjkim if (zip->entry->flags & LA_USED_ZIP64) { 1139280304Sjkim zip->entry->crc32 = archive_le32dec(p + 4); 1140280304Sjkim zip->entry->compressed_size = 1141280304Sjkim archive_le64dec(p + 8); 1142280304Sjkim zip->entry->uncompressed_size = 1143280304Sjkim archive_le64dec(p + 16); 1144280304Sjkim zip->unconsumed = 24; 1145280304Sjkim } else { 1146280304Sjkim zip->entry->crc32 = archive_le32dec(p + 4); 1147280304Sjkim zip->entry->compressed_size = 114855714Skris archive_le32dec(p + 8); 1149280304Sjkim zip->entry->uncompressed_size = 1150280304Sjkim archive_le32dec(p + 12); 1151280304Sjkim zip->unconsumed = 16; 1152280304Sjkim } 1153280304Sjkim if (zip->hctx_valid) { 1154280304Sjkim r = check_authentication_code(a, buff); 1155280304Sjkim if (r != ARCHIVE_OK) 1156280304Sjkim return (r); 1157280304Sjkim } 1158280304Sjkim zip->end_of_entry = 1; 1159280304Sjkim return (ARCHIVE_OK); 1160280304Sjkim } 1161280304Sjkim /* If not at EOF, ensure we consume at least one byte. */ 1162280304Sjkim ++p; 116355714Skris 1164280304Sjkim /* Scan forward until we see where a PK\007\010 signature 1165280304Sjkim * might be. */ 1166280304Sjkim /* Return bytes up until that point. On the next call, 1167280304Sjkim * the code above will verify the data descriptor. */ 1168280304Sjkim while (p < buff + bytes_avail - 4) { 1169280304Sjkim if (p[3] == 'P') { p += 3; } 1170109998Smarkm else if (p[3] == 'K') { p += 2; } 1171280304Sjkim else if (p[3] == '\007') { p += 1; } 1172280304Sjkim else if (p[3] == '\010' && p[2] == '\007' 1173280304Sjkim && p[1] == 'K' && p[0] == 'P') { 1174280304Sjkim if (zip->hctx_valid) 1175280304Sjkim p -= AUTH_CODE_SIZE; 1176280304Sjkim break; 1177280304Sjkim } else { p += 4; } 1178280304Sjkim } 1179280304Sjkim bytes_avail = p - buff; 1180280304Sjkim } else { 1181280304Sjkim if (zip->entry_bytes_remaining == 0) { 1182280304Sjkim zip->end_of_entry = 1; 1183280304Sjkim if (zip->hctx_valid) { 1184280304Sjkim r = check_authentication_code(a, NULL); 1185280304Sjkim if (r != ARCHIVE_OK) 1186280304Sjkim return (r); 1187280304Sjkim } 1188280304Sjkim return (ARCHIVE_OK); 1189280304Sjkim } 1190280304Sjkim /* Grab a bunch of bytes. */ 1191280304Sjkim buff = __archive_read_ahead(a, 1, &bytes_avail); 1192280304Sjkim if (bytes_avail <= 0) { 1193280304Sjkim archive_set_error(&a->archive, 1194280304Sjkim ARCHIVE_ERRNO_FILE_FORMAT, 1195280304Sjkim "Truncated ZIP file data"); 1196280304Sjkim return (ARCHIVE_FATAL); 1197280304Sjkim } 1198280304Sjkim if (bytes_avail > zip->entry_bytes_remaining) 1199280304Sjkim bytes_avail = (ssize_t)zip->entry_bytes_remaining; 1200280304Sjkim } 120155714Skris if (zip->tctx_valid || zip->cctx_valid) { 1202280304Sjkim size_t dec_size = bytes_avail; 1203280304Sjkim 1204280304Sjkim if (dec_size > zip->decrypted_buffer_size) 1205280304Sjkim dec_size = zip->decrypted_buffer_size; 1206109998Smarkm if (zip->tctx_valid) { 1207280304Sjkim trad_enc_decrypt_update(&zip->tctx, 1208280304Sjkim (const uint8_t *)buff, dec_size, 1209280304Sjkim zip->decrypted_buffer, dec_size); 1210280304Sjkim } else { 1211280304Sjkim size_t dsize = dec_size; 121255714Skris archive_hmac_sha1_update(&zip->hctx, 1213280304Sjkim (const uint8_t *)buff, dec_size); 1214280304Sjkim archive_decrypto_aes_ctr_update(&zip->cctx, 1215280304Sjkim (const uint8_t *)buff, dec_size, 1216280304Sjkim zip->decrypted_buffer, &dsize); 1217280304Sjkim } 121855714Skris bytes_avail = dec_size; 1219280304Sjkim buff = (const char *)zip->decrypted_buffer; 1220280304Sjkim } 1221280304Sjkim *size = bytes_avail; 1222280304Sjkim zip->entry_bytes_remaining -= bytes_avail; 1223280304Sjkim zip->entry_uncompressed_bytes_read += bytes_avail; 122455714Skris zip->entry_compressed_bytes_read += bytes_avail; 1225280304Sjkim zip->unconsumed += bytes_avail; 1226280304Sjkim *_buff = buff; 1227280304Sjkim return (ARCHIVE_OK); 1228280304Sjkim} 1229280304Sjkim 1230280304Sjkim#ifdef HAVE_ZLIB_H 1231280304Sjkimstatic int 1232280304Sjkimzip_deflate_init(struct archive_read *a, struct zip *zip) 1233280304Sjkim{ 123455714Skris int r; 1235280304Sjkim 1236280304Sjkim /* If we haven't yet read any data, initialize the decompressor. */ 1237280304Sjkim if (!zip->decompress_init) { 1238280304Sjkim if (zip->stream_valid) 1239280304Sjkim r = inflateReset(&zip->stream); 1240280304Sjkim else 1241280304Sjkim r = inflateInit2(&zip->stream, 1242280304Sjkim -15 /* Don't check for zlib header */); 124355714Skris if (r != Z_OK) { 1244280304Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1245280304Sjkim "Can't initialize ZIP decompression."); 1246280304Sjkim return (ARCHIVE_FATAL); 1247280304Sjkim } 1248280304Sjkim /* Stream structure has been set up. */ 124955714Skris zip->stream_valid = 1; 1250280304Sjkim /* We've initialized decompression for this stream. */ 1251280304Sjkim zip->decompress_init = 1; 1252280304Sjkim } 1253280304Sjkim return (ARCHIVE_OK); 125455714Skris} 1255280304Sjkim 1256280304Sjkimstatic int 1257280304Sjkimzip_read_data_deflate(struct archive_read *a, const void **buff, 1258280304Sjkim size_t *size, int64_t *offset) 1259280304Sjkim{ 1260109998Smarkm struct zip *zip; 1261280304Sjkim ssize_t bytes_avail; 1262280304Sjkim const void *compressed_buff, *sp; 1263280304Sjkim int r; 1264280304Sjkim 1265280304Sjkim (void)offset; /* UNUSED */ 126655714Skris 1267280304Sjkim zip = (struct zip *)(a->format->data); 1268280304Sjkim 1269280304Sjkim /* If the buffer hasn't been allocated, allocate it now. */ 1270280304Sjkim if (zip->uncompressed_buffer == NULL) { 1271280304Sjkim zip->uncompressed_buffer_size = 256 * 1024; 1272280304Sjkim zip->uncompressed_buffer 127355714Skris = (unsigned char *)malloc(zip->uncompressed_buffer_size); 1274280304Sjkim if (zip->uncompressed_buffer == NULL) { 1275280304Sjkim archive_set_error(&a->archive, ENOMEM, 1276280304Sjkim "No memory for ZIP decompression"); 1277280304Sjkim return (ARCHIVE_FATAL); 1278280304Sjkim } 127955714Skris } 1280280304Sjkim 1281280304Sjkim r = zip_deflate_init(a, zip); 1282280304Sjkim if (r != ARCHIVE_OK) 1283280304Sjkim return (r); 1284280304Sjkim 128555714Skris /* 1286280304Sjkim * Note: '1' here is a performance optimization. 1287280304Sjkim * Recall that the decompression layer returns a count of 1288280304Sjkim * available bytes; asking for more than that forces the 1289280304Sjkim * decompressor to combine reads by copying data. 1290280304Sjkim */ 1291280304Sjkim compressed_buff = sp = __archive_read_ahead(a, 1, &bytes_avail); 1292280304Sjkim if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 1293280304Sjkim && bytes_avail > zip->entry_bytes_remaining) { 1294280304Sjkim bytes_avail = (ssize_t)zip->entry_bytes_remaining; 1295280304Sjkim } 129655714Skris if (bytes_avail <= 0) { 1297280304Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 129855714Skris "Truncated ZIP file body"); 1299280304Sjkim return (ARCHIVE_FATAL); 1300280304Sjkim } 130159191Skris 1302280304Sjkim if (zip->tctx_valid || zip->cctx_valid) { 1303280304Sjkim if (zip->decrypted_bytes_remaining < (size_t)bytes_avail) { 1304280304Sjkim size_t buff_remaining = 1305280304Sjkim (zip->decrypted_buffer + zip->decrypted_buffer_size) 1306280304Sjkim - (zip->decrypted_ptr + zip->decrypted_bytes_remaining); 1307280304Sjkim 1308280304Sjkim if (buff_remaining > (size_t)bytes_avail) 1309280304Sjkim buff_remaining = (size_t)bytes_avail; 131059191Skris 1311280304Sjkim if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) && 131259191Skris zip->entry_bytes_remaining > 0) { 1313280304Sjkim if ((int64_t)(zip->decrypted_bytes_remaining 1314280304Sjkim + buff_remaining) 1315280304Sjkim > zip->entry_bytes_remaining) { 1316280304Sjkim if (zip->entry_bytes_remaining < 1317280304Sjkim (int64_t)zip->decrypted_bytes_remaining) 1318280304Sjkim buff_remaining = 0; 1319280304Sjkim else 1320280304Sjkim buff_remaining = 1321280304Sjkim (size_t)zip->entry_bytes_remaining 132268651Skris - zip->decrypted_bytes_remaining; 1323280304Sjkim } 132468651Skris } 1325280304Sjkim if (buff_remaining > 0) { 1326280304Sjkim if (zip->tctx_valid) { 132768651Skris trad_enc_decrypt_update(&zip->tctx, 1328280304Sjkim compressed_buff, buff_remaining, 1329280304Sjkim zip->decrypted_ptr 1330280304Sjkim + zip->decrypted_bytes_remaining, 1331280304Sjkim buff_remaining); 1332280304Sjkim } else { 1333160814Ssimon size_t dsize = buff_remaining; 1334280304Sjkim archive_decrypto_aes_ctr_update( 1335160814Ssimon &zip->cctx, 1336280304Sjkim compressed_buff, buff_remaining, 1337160814Ssimon zip->decrypted_ptr 1338280304Sjkim + zip->decrypted_bytes_remaining, 1339280304Sjkim &dsize); 1340280304Sjkim } 1341280304Sjkim zip->decrypted_bytes_remaining += buff_remaining; 1342280304Sjkim } 1343280304Sjkim } 1344280304Sjkim bytes_avail = zip->decrypted_bytes_remaining; 1345280304Sjkim compressed_buff = (const char *)zip->decrypted_ptr; 1346280304Sjkim } 134759191Skris 1348280304Sjkim /* 134959191Skris * A bug in zlib.h: stream.next_in should be marked 'const' 1350280304Sjkim * but isn't (the library never alters data through the 1351280304Sjkim * next_in pointer, only reads it). The result: this ugly 1352280304Sjkim * cast to remove 'const'. 1353280304Sjkim */ 1354280304Sjkim zip->stream.next_in = (Bytef *)(uintptr_t)(const void *)compressed_buff; 1355280304Sjkim zip->stream.avail_in = (uInt)bytes_avail; 1356280304Sjkim zip->stream.total_in = 0; 1357280304Sjkim zip->stream.next_out = zip->uncompressed_buffer; 1358280304Sjkim zip->stream.avail_out = (uInt)zip->uncompressed_buffer_size; 1359280304Sjkim zip->stream.total_out = 0; 1360280304Sjkim 1361280304Sjkim r = inflate(&zip->stream, 0); 1362280304Sjkim switch (r) { 1363280304Sjkim case Z_OK: 136459191Skris break; 1365280304Sjkim case Z_STREAM_END: 1366280304Sjkim zip->end_of_entry = 1; 1367280304Sjkim break; 1368280304Sjkim case Z_MEM_ERROR: 1369280304Sjkim archive_set_error(&a->archive, ENOMEM, 1370280304Sjkim "Out of memory for ZIP decompression"); 1371280304Sjkim return (ARCHIVE_FATAL); 1372280304Sjkim default: 1373280304Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1374280304Sjkim "ZIP decompression failed (%d)", r); 1375280304Sjkim return (ARCHIVE_FATAL); 1376280304Sjkim } 1377280304Sjkim 1378280304Sjkim /* Consume as much as the compressor actually used. */ 1379280304Sjkim bytes_avail = zip->stream.total_in; 1380280304Sjkim if (zip->tctx_valid || zip->cctx_valid) { 1381280304Sjkim zip->decrypted_bytes_remaining -= bytes_avail; 1382280304Sjkim if (zip->decrypted_bytes_remaining == 0) 1383280304Sjkim zip->decrypted_ptr = zip->decrypted_buffer; 1384280304Sjkim else 1385280304Sjkim zip->decrypted_ptr += bytes_avail; 1386280304Sjkim } 1387280304Sjkim /* Calculate compressed data as much as we used.*/ 1388280304Sjkim if (zip->hctx_valid) 138959191Skris archive_hmac_sha1_update(&zip->hctx, sp, bytes_avail); 1390280304Sjkim __archive_read_consume(a, bytes_avail); 1391280304Sjkim zip->entry_bytes_remaining -= bytes_avail; 1392280304Sjkim zip->entry_compressed_bytes_read += bytes_avail; 1393280304Sjkim 1394280304Sjkim *size = zip->stream.total_out; 1395280304Sjkim zip->entry_uncompressed_bytes_read += zip->stream.total_out; 1396280304Sjkim *buff = zip->uncompressed_buffer; 1397280304Sjkim 1398280304Sjkim if (zip->end_of_entry && zip->hctx_valid) { 139955714Skris r = check_authentication_code(a, NULL); 1400280304Sjkim if (r != ARCHIVE_OK) 1401280304Sjkim return (r); 1402280304Sjkim } 1403280304Sjkim 1404280304Sjkim if (zip->end_of_entry && (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) { 1405280304Sjkim const char *p; 140655714Skris 1407280304Sjkim if (NULL == (p = __archive_read_ahead(a, 24, NULL))) { 140855714Skris archive_set_error(&a->archive, 1409280304Sjkim ARCHIVE_ERRNO_FILE_FORMAT, 1410280304Sjkim "Truncated ZIP end-of-file record"); 1411280304Sjkim return (ARCHIVE_FATAL); 1412280304Sjkim } 1413280304Sjkim /* Consume the optional PK\007\010 marker. */ 1414267258Sjkim if (p[0] == 'P' && p[1] == 'K' && 1415280304Sjkim p[2] == '\007' && p[3] == '\010') { 1416280304Sjkim p += 4; 1417280304Sjkim zip->unconsumed = 4; 1418280304Sjkim } 1419280304Sjkim if (zip->entry->flags & LA_USED_ZIP64) { 1420280304Sjkim zip->entry->crc32 = archive_le32dec(p); 1421280304Sjkim zip->entry->compressed_size = archive_le64dec(p + 4); 142255714Skris zip->entry->uncompressed_size = archive_le64dec(p + 12); 1423160814Ssimon zip->unconsumed += 20; 1424280304Sjkim } else { 1425280304Sjkim zip->entry->crc32 = archive_le32dec(p); 1426280304Sjkim zip->entry->compressed_size = archive_le32dec(p + 4); 1427280304Sjkim zip->entry->uncompressed_size = archive_le32dec(p + 8); 1428280304Sjkim zip->unconsumed += 12; 142955714Skris } 1430280304Sjkim } 1431280304Sjkim 1432280304Sjkim return (ARCHIVE_OK); 1433280304Sjkim} 1434280304Sjkim#endif 1435280304Sjkim 1436280304Sjkimstatic int 1437280304Sjkimread_decryption_header(struct archive_read *a) 1438280304Sjkim{ 1439280304Sjkim struct zip *zip = (struct zip *)(a->format->data); 1440280304Sjkim const char *p; 1441280304Sjkim unsigned int remaining_size; 1442280304Sjkim unsigned int ts; 1443280304Sjkim 1444280304Sjkim /* 1445280304Sjkim * Read an initialization vector data field. 1446280304Sjkim */ 1447280304Sjkim p = __archive_read_ahead(a, 2, NULL); 144855714Skris if (p == NULL) 1449280304Sjkim goto truncated; 1450280304Sjkim ts = zip->iv_size; 1451280304Sjkim zip->iv_size = archive_le16dec(p); 1452280304Sjkim __archive_read_consume(a, 2); 1453280304Sjkim if (ts < zip->iv_size) { 1454280304Sjkim free(zip->iv); 1455280304Sjkim zip->iv = NULL; 1456280304Sjkim } 1457280304Sjkim p = __archive_read_ahead(a, zip->iv_size, NULL); 145855714Skris if (p == NULL) 1459280304Sjkim goto truncated; 1460280304Sjkim if (zip->iv == NULL) { 1461280304Sjkim zip->iv = malloc(zip->iv_size); 1462280304Sjkim if (zip->iv == NULL) 1463280304Sjkim goto nomem; 1464280304Sjkim } 146568651Skris memcpy(zip->iv, p, zip->iv_size); 1466280304Sjkim __archive_read_consume(a, zip->iv_size); 146768651Skris 1468280304Sjkim /* 1469280304Sjkim * Read a size of remaining decryption header field. 1470280304Sjkim */ 1471280304Sjkim p = __archive_read_ahead(a, 14, NULL); 1472280304Sjkim if (p == NULL) 147355714Skris goto truncated; 1474280304Sjkim remaining_size = archive_le32dec(p); 1475280304Sjkim if (remaining_size < 16 || remaining_size > (1 << 18)) 1476280304Sjkim goto corrupted; 1477280304Sjkim 1478280304Sjkim /* Check if format version is supported. */ 1479280304Sjkim if (archive_le16dec(p+4) != 3) { 148055714Skris archive_set_error(&a->archive, 1481280304Sjkim ARCHIVE_ERRNO_FILE_FORMAT, 1482280304Sjkim "Unsupported encryption format version: %u", 1483280304Sjkim archive_le16dec(p+4)); 1484280304Sjkim return (ARCHIVE_FAILED); 148555714Skris } 1486109998Smarkm 1487280304Sjkim /* 1488280304Sjkim * Read an encryption algorithm field. 1489280304Sjkim */ 1490280304Sjkim zip->alg_id = archive_le16dec(p+6); 1491280304Sjkim switch (zip->alg_id) { 1492280304Sjkim case 0x6601:/* DES */ 1493280304Sjkim case 0x6602:/* RC2 */ 1494280304Sjkim case 0x6603:/* 3DES 168 */ 1495280304Sjkim case 0x6609:/* 3DES 112 */ 1496280304Sjkim case 0x660E:/* AES 128 */ 1497280304Sjkim case 0x660F:/* AES 192 */ 1498280304Sjkim case 0x6610:/* AES 256 */ 1499280304Sjkim case 0x6702:/* RC2 (version >= 5.2) */ 1500280304Sjkim case 0x6720:/* Blowfish */ 1501280304Sjkim case 0x6721:/* Twofish */ 150255714Skris case 0x6801:/* RC4 */ 150355714Skris /* Suuported encryption algorithm. */ 1504160814Ssimon break; 150555714Skris default: 1506280304Sjkim archive_set_error(&a->archive, 1507280304Sjkim ARCHIVE_ERRNO_FILE_FORMAT, 1508280304Sjkim "Unknown encryption algorithm: %u", zip->alg_id); 1509280304Sjkim return (ARCHIVE_FAILED); 1510280304Sjkim } 1511280304Sjkim 1512280304Sjkim /* 1513280304Sjkim * Read a bit length field. 151455714Skris */ 1515238405Sjkim zip->bit_len = archive_le16dec(p+8); 1516280304Sjkim 1517280304Sjkim /* 1518280304Sjkim * Read a flags field. 1519280304Sjkim */ 1520280304Sjkim zip->flags = archive_le16dec(p+10); 1521280304Sjkim switch (zip->flags & 0xf000) { 1522280304Sjkim case 0x0001: /* Password is required to decrypt. */ 1523280304Sjkim case 0x0002: /* Certificates only. */ 1524280304Sjkim case 0x0003: /* Password or certificate required to decrypt. */ 1525238405Sjkim break; 1526280304Sjkim default: 1527280304Sjkim archive_set_error(&a->archive, 1528280304Sjkim ARCHIVE_ERRNO_FILE_FORMAT, 1529280304Sjkim "Unknown encryption flag: %u", zip->flags); 1530280304Sjkim return (ARCHIVE_FAILED); 1531280304Sjkim } 1532280304Sjkim if ((zip->flags & 0xf000) == 0 || 1533280304Sjkim (zip->flags & 0xf000) == 0x4000) { 1534280304Sjkim archive_set_error(&a->archive, 1535280304Sjkim ARCHIVE_ERRNO_FILE_FORMAT, 1536280304Sjkim "Unknown encryption flag: %u", zip->flags); 1537280304Sjkim return (ARCHIVE_FAILED); 1538280304Sjkim } 1539280304Sjkim 1540238405Sjkim /* 1541280304Sjkim * Read an encrypted random data field. 1542280304Sjkim */ 1543280304Sjkim ts = zip->erd_size; 1544280304Sjkim zip->erd_size = archive_le16dec(p+12); 1545280304Sjkim __archive_read_consume(a, 14); 1546280304Sjkim if ((zip->erd_size & 0xf) != 0 || 1547280304Sjkim (zip->erd_size + 16) > remaining_size || 1548280304Sjkim (zip->erd_size + 16) < zip->erd_size) 1549238405Sjkim goto corrupted; 1550280304Sjkim 1551238405Sjkim if (ts < zip->erd_size) { 1552280304Sjkim free(zip->erd); 1553280304Sjkim zip->erd = NULL; 1554280304Sjkim } 1555280304Sjkim p = __archive_read_ahead(a, zip->erd_size, NULL); 1556238405Sjkim if (p == NULL) 1557280304Sjkim goto truncated; 1558238405Sjkim if (zip->erd == NULL) { 1559280304Sjkim zip->erd = malloc(zip->erd_size); 1560280304Sjkim if (zip->erd == NULL) 1561238405Sjkim goto nomem; 1562280304Sjkim } 1563280304Sjkim memcpy(zip->erd, p, zip->erd_size); 1564280304Sjkim __archive_read_consume(a, zip->erd_size); 1565280304Sjkim 1566280304Sjkim /* 1567280304Sjkim * Read a reserved data field. 1568280304Sjkim */ 1569280304Sjkim p = __archive_read_ahead(a, 4, NULL); 1570280304Sjkim if (p == NULL) 1571238405Sjkim goto truncated; 1572280304Sjkim /* Reserved data size should be zero. */ 1573280304Sjkim if (archive_le32dec(p) != 0) 1574280304Sjkim goto corrupted; 1575280304Sjkim __archive_read_consume(a, 4); 1576280304Sjkim 1577280304Sjkim /* 1578280304Sjkim * Read a password validation data field. 1579238405Sjkim */ 1580280304Sjkim p = __archive_read_ahead(a, 2, NULL); 1581280304Sjkim if (p == NULL) 1582280304Sjkim goto truncated; 1583280304Sjkim ts = zip->v_size; 1584280304Sjkim zip->v_size = archive_le16dec(p); 1585280304Sjkim __archive_read_consume(a, 2); 1586280304Sjkim if ((zip->v_size & 0x0f) != 0 || 1587280304Sjkim (zip->erd_size + zip->v_size + 16) > remaining_size || 1588280304Sjkim (zip->erd_size + zip->v_size + 16) < (zip->erd_size + zip->v_size)) 1589238405Sjkim goto corrupted; 1590280304Sjkim if (ts < zip->v_size) { 1591238405Sjkim free(zip->v_data); 1592280304Sjkim zip->v_data = NULL; 1593280304Sjkim } 1594280304Sjkim p = __archive_read_ahead(a, zip->v_size, NULL); 1595280304Sjkim if (p == NULL) 1596280304Sjkim goto truncated; 1597280304Sjkim if (zip->v_data == NULL) { 1598280304Sjkim zip->v_data = malloc(zip->v_size); 1599280304Sjkim if (zip->v_data == NULL) 1600280304Sjkim goto nomem; 1601280304Sjkim } 1602280304Sjkim memcpy(zip->v_data, p, zip->v_size); 1603280304Sjkim __archive_read_consume(a, zip->v_size); 1604238405Sjkim 1605280304Sjkim p = __archive_read_ahead(a, 4, NULL); 1606280304Sjkim if (p == NULL) 1607280304Sjkim goto truncated; 1608280304Sjkim zip->v_crc32 = archive_le32dec(p); 1609280304Sjkim __archive_read_consume(a, 4); 1610280304Sjkim 1611280304Sjkim /*return (ARCHIVE_OK); 1612280304Sjkim * This is not fully implemnted yet.*/ 1613280304Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1614280304Sjkim "Encrypted file is unsupported"); 1615280304Sjkim return (ARCHIVE_FAILED); 1616238405Sjkimtruncated: 1617280304Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1618280304Sjkim "Truncated ZIP file data"); 1619238405Sjkim return (ARCHIVE_FATAL); 1620280304Sjkimcorrupted: 1621238405Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1622280304Sjkim "Corrupted ZIP file data"); 1623280304Sjkim return (ARCHIVE_FATAL); 1624280304Sjkimnomem: 1625280304Sjkim archive_set_error(&a->archive, ENOMEM, 1626280304Sjkim "No memory for ZIP decryption"); 1627280304Sjkim return (ARCHIVE_FATAL); 1628238405Sjkim} 1629280304Sjkim 1630280304Sjkimstatic int 1631280304Sjkimzip_alloc_decryption_buffer(struct archive_read *a) 1632280304Sjkim{ 1633280304Sjkim struct zip *zip = (struct zip *)(a->format->data); 1634238405Sjkim size_t bs = 256 * 1024; 1635280304Sjkim 1636280304Sjkim if (zip->decrypted_buffer == NULL) { 1637280304Sjkim zip->decrypted_buffer_size = bs; 1638280304Sjkim zip->decrypted_buffer = malloc(bs); 1639280304Sjkim if (zip->decrypted_buffer == NULL) { 1640238405Sjkim archive_set_error(&a->archive, ENOMEM, 1641280304Sjkim "No memory for ZIP decryption"); 1642280304Sjkim return (ARCHIVE_FATAL); 1643280304Sjkim } 1644280304Sjkim } 1645280304Sjkim zip->decrypted_ptr = zip->decrypted_buffer; 1646280304Sjkim return (ARCHIVE_OK); 1647280304Sjkim} 1648280304Sjkim 1649238405Sjkimstatic int 1650238405Sjkiminit_traditional_PKWARE_decryption(struct archive_read *a) 1651280304Sjkim{ 1652280304Sjkim struct zip *zip = (struct zip *)(a->format->data); 1653238405Sjkim const void *p; 1654238405Sjkim int retry; 1655280304Sjkim int r; 1656280304Sjkim 1657280304Sjkim if (zip->tctx_valid) 1658280304Sjkim return (ARCHIVE_OK); 1659280304Sjkim 1660280304Sjkim /* 1661280304Sjkim Read the 12 bytes encryption header stored at 1662280304Sjkim the start of the data area. 1663280304Sjkim */ 1664280304Sjkim#define ENC_HEADER_SIZE 12 1665280304Sjkim if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 1666280304Sjkim && zip->entry_bytes_remaining < ENC_HEADER_SIZE) { 1667280304Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1668280304Sjkim "Truncated Zip encrypted body: only %jd bytes available", 1669280304Sjkim (intmax_t)zip->entry_bytes_remaining); 1670238405Sjkim return (ARCHIVE_FATAL); 1671280304Sjkim } 1672238405Sjkim 1673280304Sjkim p = __archive_read_ahead(a, ENC_HEADER_SIZE, NULL); 1674280304Sjkim if (p == NULL) { 1675238405Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1676238405Sjkim "Truncated ZIP file data"); 1677280304Sjkim return (ARCHIVE_FATAL); 1678280304Sjkim } 1679280304Sjkim 1680280304Sjkim for (retry = 0;; retry++) { 1681280304Sjkim const char *passphrase; 1682280304Sjkim uint8_t crcchk; 1683280304Sjkim 1684280304Sjkim passphrase = __archive_read_next_passphrase(a); 1685280304Sjkim if (passphrase == NULL) { 1686280304Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1687280304Sjkim (retry > 0)? 1688280304Sjkim "Incorrect passphrase": 1689280304Sjkim "Passphrase required for this entry"); 1690280304Sjkim return (ARCHIVE_FAILED); 1691280304Sjkim } 1692280304Sjkim 1693280304Sjkim /* 1694238405Sjkim * Initialize ctx for Traditional PKWARE Decyption. 1695238405Sjkim */ 1696280304Sjkim r = trad_enc_init(&zip->tctx, passphrase, strlen(passphrase), 1697280304Sjkim p, ENC_HEADER_SIZE, &crcchk); 1698280304Sjkim if (r == 0 && crcchk == zip->entry->decdat) 1699280304Sjkim break;/* The passphrase is OK. */ 1700280304Sjkim if (retry > 10000) { 1701280304Sjkim /* Avoid infinity loop. */ 1702280304Sjkim archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1703280304Sjkim "Too many incorrect passphrases"); 1704280304Sjkim return (ARCHIVE_FAILED); 1705280304Sjkim } 1706280304Sjkim } 1707238405Sjkim 1708238405Sjkim __archive_read_consume(a, ENC_HEADER_SIZE); 1709280304Sjkim zip->tctx_valid = 1; 1710280304Sjkim if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) { 1711280304Sjkim zip->entry_bytes_remaining -= ENC_HEADER_SIZE; 1712280304Sjkim } 1713280304Sjkim /*zip->entry_uncompressed_bytes_read += ENC_HEADER_SIZE;*/ 1714280304Sjkim zip->entry_compressed_bytes_read += ENC_HEADER_SIZE; 1715280304Sjkim zip->decrypted_bytes_remaining = 0; 1716280304Sjkim 1717280304Sjkim return (zip_alloc_decryption_buffer(a)); 1718280304Sjkim#undef ENC_HEADER_SIZE 1719280304Sjkim} 1720238405Sjkim 1721238405Sjkimstatic int 1722280304Sjkiminit_WinZip_AES_decryption(struct archive_read *a) 1723280304Sjkim{ 1724280304Sjkim struct zip *zip = (struct zip *)(a->format->data); 1725280304Sjkim const void *p; 1726280304Sjkim const uint8_t *pv; 1727280304Sjkim size_t key_len, salt_len; 1728280304Sjkim uint8_t derived_key[MAX_DERIVED_KEY_BUF_SIZE]; 1729280304Sjkim int retry; 1730280304Sjkim int r; 1731280304Sjkim 1732280304Sjkim if (zip->cctx_valid || zip->hctx_valid) 1733 return (ARCHIVE_OK); 1734 1735 switch (zip->entry->aes_extra.strength) { 1736 case 1: salt_len = 8; key_len = 16; break; 1737 case 2: salt_len = 12; key_len = 24; break; 1738 case 3: salt_len = 16; key_len = 32; break; 1739 default: goto corrupted; 1740 } 1741 p = __archive_read_ahead(a, salt_len + 2, NULL); 1742 if (p == NULL) 1743 goto truncated; 1744 1745 for (retry = 0;; retry++) { 1746 const char *passphrase; 1747 1748 passphrase = __archive_read_next_passphrase(a); 1749 if (passphrase == NULL) { 1750 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1751 (retry > 0)? 1752 "Incorrect passphrase": 1753 "Passphrase required for this entry"); 1754 return (ARCHIVE_FAILED); 1755 } 1756 memset(derived_key, 0, sizeof(derived_key)); 1757 r = archive_pbkdf2_sha1(passphrase, strlen(passphrase), 1758 p, salt_len, 1000, derived_key, key_len * 2 + 2); 1759 if (r != 0) { 1760 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1761 "Decryption is unsupported due to lack of " 1762 "crypto library"); 1763 return (ARCHIVE_FAILED); 1764 } 1765 1766 /* Check password verification value. */ 1767 pv = ((const uint8_t *)p) + salt_len; 1768 if (derived_key[key_len * 2] == pv[0] && 1769 derived_key[key_len * 2 + 1] == pv[1]) 1770 break;/* The passphrase is OK. */ 1771 if (retry > 10000) { 1772 /* Avoid infinity loop. */ 1773 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1774 "Too many incorrect passphrases"); 1775 return (ARCHIVE_FAILED); 1776 } 1777 } 1778 1779 r = archive_decrypto_aes_ctr_init(&zip->cctx, derived_key, key_len); 1780 if (r != 0) { 1781 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1782 "Decryption is unsupported due to lack of crypto library"); 1783 return (ARCHIVE_FAILED); 1784 } 1785 r = archive_hmac_sha1_init(&zip->hctx, derived_key + key_len, key_len); 1786 if (r != 0) { 1787 archive_decrypto_aes_ctr_release(&zip->cctx); 1788 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1789 "Failed to initialize HMAC-SHA1"); 1790 return (ARCHIVE_FAILED); 1791 } 1792 zip->cctx_valid = zip->hctx_valid = 1; 1793 __archive_read_consume(a, salt_len + 2); 1794 zip->entry_bytes_remaining -= salt_len + 2 + AUTH_CODE_SIZE; 1795 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 1796 && zip->entry_bytes_remaining < 0) 1797 goto corrupted; 1798 zip->entry_compressed_bytes_read += salt_len + 2 + AUTH_CODE_SIZE; 1799 zip->decrypted_bytes_remaining = 0; 1800 1801 zip->entry->compression = zip->entry->aes_extra.compression; 1802 return (zip_alloc_decryption_buffer(a)); 1803 1804truncated: 1805 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1806 "Truncated ZIP file data"); 1807 return (ARCHIVE_FATAL); 1808corrupted: 1809 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1810 "Corrupted ZIP file data"); 1811 return (ARCHIVE_FATAL); 1812} 1813 1814static int 1815archive_read_format_zip_read_data(struct archive_read *a, 1816 const void **buff, size_t *size, int64_t *offset) 1817{ 1818 int r; 1819 struct zip *zip = (struct zip *)(a->format->data); 1820 1821 if (zip->has_encrypted_entries == 1822 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) { 1823 zip->has_encrypted_entries = 0; 1824 } 1825 1826 *offset = zip->entry_uncompressed_bytes_read; 1827 *size = 0; 1828 *buff = NULL; 1829 1830 /* If we hit end-of-entry last time, return ARCHIVE_EOF. */ 1831 if (zip->end_of_entry) 1832 return (ARCHIVE_EOF); 1833 1834 /* Return EOF immediately if this is a non-regular file. */ 1835 if (AE_IFREG != (zip->entry->mode & AE_IFMT)) 1836 return (ARCHIVE_EOF); 1837 1838 __archive_read_consume(a, zip->unconsumed); 1839 zip->unconsumed = 0; 1840 1841 if (zip->init_decryption) { 1842 zip->has_encrypted_entries = 1; 1843 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED) 1844 r = read_decryption_header(a); 1845 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION) 1846 r = init_WinZip_AES_decryption(a); 1847 else 1848 r = init_traditional_PKWARE_decryption(a); 1849 if (r != ARCHIVE_OK) 1850 return (r); 1851 zip->init_decryption = 0; 1852 } 1853 1854 switch(zip->entry->compression) { 1855 case 0: /* No compression. */ 1856 r = zip_read_data_none(a, buff, size, offset); 1857 break; 1858#ifdef HAVE_ZLIB_H 1859 case 8: /* Deflate compression. */ 1860 r = zip_read_data_deflate(a, buff, size, offset); 1861 break; 1862#endif 1863 default: /* Unsupported compression. */ 1864 /* Return a warning. */ 1865 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 1866 "Unsupported ZIP compression method (%s)", 1867 compression_name(zip->entry->compression)); 1868 /* We can't decompress this entry, but we will 1869 * be able to skip() it and try the next entry. */ 1870 return (ARCHIVE_FAILED); 1871 break; 1872 } 1873 if (r != ARCHIVE_OK) 1874 return (r); 1875 /* Update checksum */ 1876 if (*size) 1877 zip->entry_crc32 = zip->crc32func(zip->entry_crc32, *buff, 1878 (unsigned)*size); 1879 /* If we hit the end, swallow any end-of-data marker. */ 1880 if (zip->end_of_entry) { 1881 /* Check file size, CRC against these values. */ 1882 if (zip->entry->compressed_size != 1883 zip->entry_compressed_bytes_read) { 1884 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1885 "ZIP compressed data is wrong size " 1886 "(read %jd, expected %jd)", 1887 (intmax_t)zip->entry_compressed_bytes_read, 1888 (intmax_t)zip->entry->compressed_size); 1889 return (ARCHIVE_WARN); 1890 } 1891 /* Size field only stores the lower 32 bits of the actual 1892 * size. */ 1893 if ((zip->entry->uncompressed_size & UINT32_MAX) 1894 != (zip->entry_uncompressed_bytes_read & UINT32_MAX)) { 1895 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1896 "ZIP uncompressed data is wrong size " 1897 "(read %jd, expected %jd)\n", 1898 (intmax_t)zip->entry_uncompressed_bytes_read, 1899 (intmax_t)zip->entry->uncompressed_size); 1900 return (ARCHIVE_WARN); 1901 } 1902 /* Check computed CRC against header */ 1903 if ((!zip->hctx_valid || 1904 zip->entry->aes_extra.vendor != AES_VENDOR_AE_2) && 1905 zip->entry->crc32 != zip->entry_crc32 1906 && !zip->ignore_crc32) { 1907 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1908 "ZIP bad CRC: 0x%lx should be 0x%lx", 1909 (unsigned long)zip->entry_crc32, 1910 (unsigned long)zip->entry->crc32); 1911 return (ARCHIVE_WARN); 1912 } 1913 } 1914 1915 return (ARCHIVE_OK); 1916} 1917 1918static int 1919archive_read_format_zip_cleanup(struct archive_read *a) 1920{ 1921 struct zip *zip; 1922 struct zip_entry *zip_entry, *next_zip_entry; 1923 1924 zip = (struct zip *)(a->format->data); 1925#ifdef HAVE_ZLIB_H 1926 if (zip->stream_valid) 1927 inflateEnd(&zip->stream); 1928 free(zip->uncompressed_buffer); 1929#endif 1930 if (zip->zip_entries) { 1931 zip_entry = zip->zip_entries; 1932 while (zip_entry != NULL) { 1933 next_zip_entry = zip_entry->next; 1934 archive_string_free(&zip_entry->rsrcname); 1935 free(zip_entry); 1936 zip_entry = next_zip_entry; 1937 } 1938 } 1939 free(zip->decrypted_buffer); 1940 if (zip->cctx_valid) 1941 archive_decrypto_aes_ctr_release(&zip->cctx); 1942 if (zip->hctx_valid) 1943 archive_hmac_sha1_cleanup(&zip->hctx); 1944 free(zip->iv); 1945 free(zip->erd); 1946 free(zip->v_data); 1947 archive_string_free(&zip->format_name); 1948 free(zip); 1949 (a->format->data) = NULL; 1950 return (ARCHIVE_OK); 1951} 1952 1953static int 1954archive_read_format_zip_has_encrypted_entries(struct archive_read *_a) 1955{ 1956 if (_a && _a->format) { 1957 struct zip * zip = (struct zip *)_a->format->data; 1958 if (zip) { 1959 return zip->has_encrypted_entries; 1960 } 1961 } 1962 return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; 1963} 1964 1965static int 1966archive_read_format_zip_options(struct archive_read *a, 1967 const char *key, const char *val) 1968{ 1969 struct zip *zip; 1970 int ret = ARCHIVE_FAILED; 1971 1972 zip = (struct zip *)(a->format->data); 1973 if (strcmp(key, "compat-2x") == 0) { 1974 /* Handle filenames as libarchive 2.x */ 1975 zip->init_default_conversion = (val != NULL) ? 1 : 0; 1976 return (ARCHIVE_OK); 1977 } else if (strcmp(key, "hdrcharset") == 0) { 1978 if (val == NULL || val[0] == 0) 1979 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1980 "zip: hdrcharset option needs a character-set name" 1981 ); 1982 else { 1983 zip->sconv = archive_string_conversion_from_charset( 1984 &a->archive, val, 0); 1985 if (zip->sconv != NULL) { 1986 if (strcmp(val, "UTF-8") == 0) 1987 zip->sconv_utf8 = zip->sconv; 1988 ret = ARCHIVE_OK; 1989 } else 1990 ret = ARCHIVE_FATAL; 1991 } 1992 return (ret); 1993 } else if (strcmp(key, "ignorecrc32") == 0) { 1994 /* Mostly useful for testing. */ 1995 if (val == NULL || val[0] == 0) { 1996 zip->crc32func = real_crc32; 1997 zip->ignore_crc32 = 0; 1998 } else { 1999 zip->crc32func = fake_crc32; 2000 zip->ignore_crc32 = 1; 2001 } 2002 return (ARCHIVE_OK); 2003 } else if (strcmp(key, "mac-ext") == 0) { 2004 zip->process_mac_extensions = (val != NULL && val[0] != 0); 2005 return (ARCHIVE_OK); 2006 } 2007 2008 /* Note: The "warn" return is just to inform the options 2009 * supervisor that we didn't handle it. It will generate 2010 * a suitable error if no one used this option. */ 2011 return (ARCHIVE_WARN); 2012} 2013 2014int 2015archive_read_support_format_zip(struct archive *a) 2016{ 2017 int r; 2018 r = archive_read_support_format_zip_streamable(a); 2019 if (r != ARCHIVE_OK) 2020 return r; 2021 return (archive_read_support_format_zip_seekable(a)); 2022} 2023 2024/* ------------------------------------------------------------------------ */ 2025 2026/* 2027 * Streaming-mode support 2028 */ 2029 2030 2031static int 2032archive_read_support_format_zip_capabilities_streamable(struct archive_read * a) 2033{ 2034 (void)a; /* UNUSED */ 2035 return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA | 2036 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA); 2037} 2038 2039static int 2040archive_read_format_zip_streamable_bid(struct archive_read *a, int best_bid) 2041{ 2042 const char *p; 2043 2044 (void)best_bid; /* UNUSED */ 2045 2046 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL) 2047 return (-1); 2048 2049 /* 2050 * Bid of 29 here comes from: 2051 * + 16 bits for "PK", 2052 * + next 16-bit field has 6 options so contributes 2053 * about 16 - log_2(6) ~= 16 - 2.6 ~= 13 bits 2054 * 2055 * So we've effectively verified ~29 total bits of check data. 2056 */ 2057 if (p[0] == 'P' && p[1] == 'K') { 2058 if ((p[2] == '\001' && p[3] == '\002') 2059 || (p[2] == '\003' && p[3] == '\004') 2060 || (p[2] == '\005' && p[3] == '\006') 2061 || (p[2] == '\006' && p[3] == '\006') 2062 || (p[2] == '\007' && p[3] == '\010') 2063 || (p[2] == '0' && p[3] == '0')) 2064 return (29); 2065 } 2066 2067 /* TODO: It's worth looking ahead a little bit for a valid 2068 * PK signature. In particular, that would make it possible 2069 * to read some UUEncoded SFX files or SFX files coming from 2070 * a network socket. */ 2071 2072 return (0); 2073} 2074 2075static int 2076archive_read_format_zip_streamable_read_header(struct archive_read *a, 2077 struct archive_entry *entry) 2078{ 2079 struct zip *zip; 2080 2081 a->archive.archive_format = ARCHIVE_FORMAT_ZIP; 2082 if (a->archive.archive_format_name == NULL) 2083 a->archive.archive_format_name = "ZIP"; 2084 2085 zip = (struct zip *)(a->format->data); 2086 2087 /* 2088 * It should be sufficient to call archive_read_next_header() for 2089 * a reader to determine if an entry is encrypted or not. If the 2090 * encryption of an entry is only detectable when calling 2091 * archive_read_data(), so be it. We'll do the same check there 2092 * as well. 2093 */ 2094 if (zip->has_encrypted_entries == 2095 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) 2096 zip->has_encrypted_entries = 0; 2097 2098 /* Make sure we have a zip_entry structure to use. */ 2099 if (zip->zip_entries == NULL) { 2100 zip->zip_entries = malloc(sizeof(struct zip_entry)); 2101 if (zip->zip_entries == NULL) { 2102 archive_set_error(&a->archive, ENOMEM, 2103 "Out of memory"); 2104 return ARCHIVE_FATAL; 2105 } 2106 } 2107 zip->entry = zip->zip_entries; 2108 memset(zip->entry, 0, sizeof(struct zip_entry)); 2109 2110 if (zip->cctx_valid) 2111 archive_decrypto_aes_ctr_release(&zip->cctx); 2112 if (zip->hctx_valid) 2113 archive_hmac_sha1_cleanup(&zip->hctx); 2114 zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0; 2115 __archive_read_reset_passphrase(a); 2116 2117 /* Search ahead for the next local file header. */ 2118 __archive_read_consume(a, zip->unconsumed); 2119 zip->unconsumed = 0; 2120 for (;;) { 2121 int64_t skipped = 0; 2122 const char *p, *end; 2123 ssize_t bytes; 2124 2125 p = __archive_read_ahead(a, 4, &bytes); 2126 if (p == NULL) 2127 return (ARCHIVE_FATAL); 2128 end = p + bytes; 2129 2130 while (p + 4 <= end) { 2131 if (p[0] == 'P' && p[1] == 'K') { 2132 if (p[2] == '\003' && p[3] == '\004') { 2133 /* Regular file entry. */ 2134 __archive_read_consume(a, skipped); 2135 return zip_read_local_file_header(a, 2136 entry, zip); 2137 } 2138 2139 /* 2140 * TODO: We cannot restore permissions 2141 * based only on the local file headers. 2142 * Consider scanning the central 2143 * directory and returning additional 2144 * entries for at least directories. 2145 * This would allow us to properly set 2146 * directory permissions. 2147 * 2148 * This won't help us fix symlinks 2149 * and may not help with regular file 2150 * permissions, either. <sigh> 2151 */ 2152 if (p[2] == '\001' && p[3] == '\002') { 2153 return (ARCHIVE_EOF); 2154 } 2155 2156 /* End of central directory? Must be an 2157 * empty archive. */ 2158 if ((p[2] == '\005' && p[3] == '\006') 2159 || (p[2] == '\006' && p[3] == '\006')) 2160 return (ARCHIVE_EOF); 2161 } 2162 ++p; 2163 ++skipped; 2164 } 2165 __archive_read_consume(a, skipped); 2166 } 2167} 2168 2169static int 2170archive_read_format_zip_read_data_skip_streamable(struct archive_read *a) 2171{ 2172 struct zip *zip; 2173 int64_t bytes_skipped; 2174 2175 zip = (struct zip *)(a->format->data); 2176 bytes_skipped = __archive_read_consume(a, zip->unconsumed); 2177 zip->unconsumed = 0; 2178 if (bytes_skipped < 0) 2179 return (ARCHIVE_FATAL); 2180 2181 /* If we've already read to end of data, we're done. */ 2182 if (zip->end_of_entry) 2183 return (ARCHIVE_OK); 2184 2185 /* So we know we're streaming... */ 2186 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) 2187 || zip->entry->compressed_size > 0) { 2188 /* We know the compressed length, so we can just skip. */ 2189 bytes_skipped = __archive_read_consume(a, 2190 zip->entry_bytes_remaining); 2191 if (bytes_skipped < 0) 2192 return (ARCHIVE_FATAL); 2193 return (ARCHIVE_OK); 2194 } 2195 2196 if (zip->init_decryption) { 2197 int r; 2198 2199 zip->has_encrypted_entries = 1; 2200 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED) 2201 r = read_decryption_header(a); 2202 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION) 2203 r = init_WinZip_AES_decryption(a); 2204 else 2205 r = init_traditional_PKWARE_decryption(a); 2206 if (r != ARCHIVE_OK) 2207 return (r); 2208 zip->init_decryption = 0; 2209 } 2210 2211 /* We're streaming and we don't know the length. */ 2212 /* If the body is compressed and we know the format, we can 2213 * find an exact end-of-entry by decompressing it. */ 2214 switch (zip->entry->compression) { 2215#ifdef HAVE_ZLIB_H 2216 case 8: /* Deflate compression. */ 2217 while (!zip->end_of_entry) { 2218 int64_t offset = 0; 2219 const void *buff = NULL; 2220 size_t size = 0; 2221 int r; 2222 r = zip_read_data_deflate(a, &buff, &size, &offset); 2223 if (r != ARCHIVE_OK) 2224 return (r); 2225 } 2226 return ARCHIVE_OK; 2227#endif 2228 default: /* Uncompressed or unknown. */ 2229 /* Scan for a PK\007\010 signature. */ 2230 for (;;) { 2231 const char *p, *buff; 2232 ssize_t bytes_avail; 2233 buff = __archive_read_ahead(a, 16, &bytes_avail); 2234 if (bytes_avail < 16) { 2235 archive_set_error(&a->archive, 2236 ARCHIVE_ERRNO_FILE_FORMAT, 2237 "Truncated ZIP file data"); 2238 return (ARCHIVE_FATAL); 2239 } 2240 p = buff; 2241 while (p <= buff + bytes_avail - 16) { 2242 if (p[3] == 'P') { p += 3; } 2243 else if (p[3] == 'K') { p += 2; } 2244 else if (p[3] == '\007') { p += 1; } 2245 else if (p[3] == '\010' && p[2] == '\007' 2246 && p[1] == 'K' && p[0] == 'P') { 2247 if (zip->entry->flags & LA_USED_ZIP64) 2248 __archive_read_consume(a, 2249 p - buff + 24); 2250 else 2251 __archive_read_consume(a, 2252 p - buff + 16); 2253 return ARCHIVE_OK; 2254 } else { p += 4; } 2255 } 2256 __archive_read_consume(a, p - buff); 2257 } 2258 } 2259} 2260 2261int 2262archive_read_support_format_zip_streamable(struct archive *_a) 2263{ 2264 struct archive_read *a = (struct archive_read *)_a; 2265 struct zip *zip; 2266 int r; 2267 2268 archive_check_magic(_a, ARCHIVE_READ_MAGIC, 2269 ARCHIVE_STATE_NEW, "archive_read_support_format_zip"); 2270 2271 zip = (struct zip *)calloc(1, sizeof(*zip)); 2272 if (zip == NULL) { 2273 archive_set_error(&a->archive, ENOMEM, 2274 "Can't allocate zip data"); 2275 return (ARCHIVE_FATAL); 2276 } 2277 2278 /* Streamable reader doesn't support mac extensions. */ 2279 zip->process_mac_extensions = 0; 2280 2281 /* 2282 * Until enough data has been read, we cannot tell about 2283 * any encrypted entries yet. 2284 */ 2285 zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; 2286 zip->crc32func = real_crc32; 2287 2288 r = __archive_read_register_format(a, 2289 zip, 2290 "zip", 2291 archive_read_format_zip_streamable_bid, 2292 archive_read_format_zip_options, 2293 archive_read_format_zip_streamable_read_header, 2294 archive_read_format_zip_read_data, 2295 archive_read_format_zip_read_data_skip_streamable, 2296 NULL, 2297 archive_read_format_zip_cleanup, 2298 archive_read_support_format_zip_capabilities_streamable, 2299 archive_read_format_zip_has_encrypted_entries); 2300 2301 if (r != ARCHIVE_OK) 2302 free(zip); 2303 return (ARCHIVE_OK); 2304} 2305 2306/* ------------------------------------------------------------------------ */ 2307 2308/* 2309 * Seeking-mode support 2310 */ 2311 2312static int 2313archive_read_support_format_zip_capabilities_seekable(struct archive_read * a) 2314{ 2315 (void)a; /* UNUSED */ 2316 return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA | 2317 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA); 2318} 2319 2320/* 2321 * TODO: This is a performance sink because it forces the read core to 2322 * drop buffered data from the start of file, which will then have to 2323 * be re-read again if this bidder loses. 2324 * 2325 * We workaround this a little by passing in the best bid so far so 2326 * that later bidders can do nothing if they know they'll never 2327 * outbid. But we can certainly do better... 2328 */ 2329static int 2330read_eocd(struct zip *zip, const char *p, int64_t current_offset) 2331{ 2332 /* Sanity-check the EOCD we've found. */ 2333 2334 /* This must be the first volume. */ 2335 if (archive_le16dec(p + 4) != 0) 2336 return 0; 2337 /* Central directory must be on this volume. */ 2338 if (archive_le16dec(p + 4) != archive_le16dec(p + 6)) 2339 return 0; 2340 /* All central directory entries must be on this volume. */ 2341 if (archive_le16dec(p + 10) != archive_le16dec(p + 8)) 2342 return 0; 2343 /* Central directory can't extend beyond start of EOCD record. */ 2344 if (archive_le32dec(p + 16) + archive_le32dec(p + 12) 2345 > current_offset) 2346 return 0; 2347 2348 /* Save the central directory location for later use. */ 2349 zip->central_directory_offset = archive_le32dec(p + 16); 2350 2351 /* This is just a tiny bit higher than the maximum 2352 returned by the streaming Zip bidder. This ensures 2353 that the more accurate seeking Zip parser wins 2354 whenever seek is available. */ 2355 return 32; 2356} 2357 2358/* 2359 * Examine Zip64 EOCD locator: If it's valid, store the information 2360 * from it. 2361 */ 2362static void 2363read_zip64_eocd(struct archive_read *a, struct zip *zip, const char *p) 2364{ 2365 int64_t eocd64_offset; 2366 int64_t eocd64_size; 2367 2368 /* Sanity-check the locator record. */ 2369 2370 /* Central dir must be on first volume. */ 2371 if (archive_le32dec(p + 4) != 0) 2372 return; 2373 /* Must be only a single volume. */ 2374 if (archive_le32dec(p + 16) != 1) 2375 return; 2376 2377 /* Find the Zip64 EOCD record. */ 2378 eocd64_offset = archive_le64dec(p + 8); 2379 if (__archive_read_seek(a, eocd64_offset, SEEK_SET) < 0) 2380 return; 2381 if ((p = __archive_read_ahead(a, 56, NULL)) == NULL) 2382 return; 2383 /* Make sure we can read all of it. */ 2384 eocd64_size = archive_le64dec(p + 4) + 12; 2385 if (eocd64_size < 56 || eocd64_size > 16384) 2386 return; 2387 if ((p = __archive_read_ahead(a, (size_t)eocd64_size, NULL)) == NULL) 2388 return; 2389 2390 /* Sanity-check the EOCD64 */ 2391 if (archive_le32dec(p + 16) != 0) /* Must be disk #0 */ 2392 return; 2393 if (archive_le32dec(p + 20) != 0) /* CD must be on disk #0 */ 2394 return; 2395 /* CD can't be split. */ 2396 if (archive_le64dec(p + 24) != archive_le64dec(p + 32)) 2397 return; 2398 2399 /* Save the central directory offset for later use. */ 2400 zip->central_directory_offset = archive_le64dec(p + 48); 2401} 2402 2403static int 2404archive_read_format_zip_seekable_bid(struct archive_read *a, int best_bid) 2405{ 2406 struct zip *zip = (struct zip *)a->format->data; 2407 int64_t file_size, current_offset; 2408 const char *p; 2409 int i, tail; 2410 2411 /* If someone has already bid more than 32, then avoid 2412 trashing the look-ahead buffers with a seek. */ 2413 if (best_bid > 32) 2414 return (-1); 2415 2416 file_size = __archive_read_seek(a, 0, SEEK_END); 2417 if (file_size <= 0) 2418 return 0; 2419 2420 /* Search last 16k of file for end-of-central-directory 2421 * record (which starts with PK\005\006) */ 2422 tail = (int)zipmin(1024 * 16, file_size); 2423 current_offset = __archive_read_seek(a, -tail, SEEK_END); 2424 if (current_offset < 0) 2425 return 0; 2426 if ((p = __archive_read_ahead(a, (size_t)tail, NULL)) == NULL) 2427 return 0; 2428 /* Boyer-Moore search backwards from the end, since we want 2429 * to match the last EOCD in the file (there can be more than 2430 * one if there is an uncompressed Zip archive as a member 2431 * within this Zip archive). */ 2432 for (i = tail - 22; i > 0;) { 2433 switch (p[i]) { 2434 case 'P': 2435 if (memcmp(p + i, "PK\005\006", 4) == 0) { 2436 int ret = read_eocd(zip, p + i, 2437 current_offset + i); 2438 if (ret > 0) { 2439 /* Zip64 EOCD locator precedes 2440 * regular EOCD if present. */ 2441 if (i >= 20 2442 && memcmp(p + i - 20, "PK\006\007", 4) == 0) { 2443 read_zip64_eocd(a, zip, p + i - 20); 2444 } 2445 return (ret); 2446 } 2447 } 2448 i -= 4; 2449 break; 2450 case 'K': i -= 1; break; 2451 case 005: i -= 2; break; 2452 case 006: i -= 3; break; 2453 default: i -= 4; break; 2454 } 2455 } 2456 return 0; 2457} 2458 2459/* The red-black trees are only used in seeking mode to manage 2460 * the in-memory copy of the central directory. */ 2461 2462static int 2463cmp_node(const struct archive_rb_node *n1, const struct archive_rb_node *n2) 2464{ 2465 const struct zip_entry *e1 = (const struct zip_entry *)n1; 2466 const struct zip_entry *e2 = (const struct zip_entry *)n2; 2467 2468 if (e1->local_header_offset > e2->local_header_offset) 2469 return -1; 2470 if (e1->local_header_offset < e2->local_header_offset) 2471 return 1; 2472 return 0; 2473} 2474 2475static int 2476cmp_key(const struct archive_rb_node *n, const void *key) 2477{ 2478 /* This function won't be called */ 2479 (void)n; /* UNUSED */ 2480 (void)key; /* UNUSED */ 2481 return 1; 2482} 2483 2484static const struct archive_rb_tree_ops rb_ops = { 2485 &cmp_node, &cmp_key 2486}; 2487 2488static int 2489rsrc_cmp_node(const struct archive_rb_node *n1, 2490 const struct archive_rb_node *n2) 2491{ 2492 const struct zip_entry *e1 = (const struct zip_entry *)n1; 2493 const struct zip_entry *e2 = (const struct zip_entry *)n2; 2494 2495 return (strcmp(e2->rsrcname.s, e1->rsrcname.s)); 2496} 2497 2498static int 2499rsrc_cmp_key(const struct archive_rb_node *n, const void *key) 2500{ 2501 const struct zip_entry *e = (const struct zip_entry *)n; 2502 return (strcmp((const char *)key, e->rsrcname.s)); 2503} 2504 2505static const struct archive_rb_tree_ops rb_rsrc_ops = { 2506 &rsrc_cmp_node, &rsrc_cmp_key 2507}; 2508 2509static const char * 2510rsrc_basename(const char *name, size_t name_length) 2511{ 2512 const char *s, *r; 2513 2514 r = s = name; 2515 for (;;) { 2516 s = memchr(s, '/', name_length - (s - name)); 2517 if (s == NULL) 2518 break; 2519 r = ++s; 2520 } 2521 return (r); 2522} 2523 2524static void 2525expose_parent_dirs(struct zip *zip, const char *name, size_t name_length) 2526{ 2527 struct archive_string str; 2528 struct zip_entry *dir; 2529 char *s; 2530 2531 archive_string_init(&str); 2532 archive_strncpy(&str, name, name_length); 2533 for (;;) { 2534 s = strrchr(str.s, '/'); 2535 if (s == NULL) 2536 break; 2537 *s = '\0'; 2538 /* Transfer the parent directory from zip->tree_rsrc RB 2539 * tree to zip->tree RB tree to expose. */ 2540 dir = (struct zip_entry *) 2541 __archive_rb_tree_find_node(&zip->tree_rsrc, str.s); 2542 if (dir == NULL) 2543 break; 2544 __archive_rb_tree_remove_node(&zip->tree_rsrc, &dir->node); 2545 archive_string_free(&dir->rsrcname); 2546 __archive_rb_tree_insert_node(&zip->tree, &dir->node); 2547 } 2548 archive_string_free(&str); 2549} 2550 2551static int 2552slurp_central_directory(struct archive_read *a, struct zip *zip) 2553{ 2554 ssize_t i; 2555 unsigned found; 2556 int64_t correction; 2557 ssize_t bytes_avail; 2558 const char *p; 2559 2560 /* 2561 * Find the start of the central directory. The end-of-CD 2562 * record has our starting point, but there are lots of 2563 * Zip archives which have had other data prepended to the 2564 * file, which makes the recorded offsets all too small. 2565 * So we search forward from the specified offset until we 2566 * find the real start of the central directory. Then we 2567 * know the correction we need to apply to account for leading 2568 * padding. 2569 */ 2570 if (__archive_read_seek(a, zip->central_directory_offset, SEEK_SET) < 0) 2571 return ARCHIVE_FATAL; 2572 2573 found = 0; 2574 while (!found) { 2575 if ((p = __archive_read_ahead(a, 20, &bytes_avail)) == NULL) 2576 return ARCHIVE_FATAL; 2577 for (found = 0, i = 0; !found && i < bytes_avail - 4;) { 2578 switch (p[i + 3]) { 2579 case 'P': i += 3; break; 2580 case 'K': i += 2; break; 2581 case 001: i += 1; break; 2582 case 002: 2583 if (memcmp(p + i, "PK\001\002", 4) == 0) { 2584 p += i; 2585 found = 1; 2586 } else 2587 i += 4; 2588 break; 2589 case 005: i += 1; break; 2590 case 006: 2591 if (memcmp(p + i, "PK\005\006", 4) == 0) { 2592 p += i; 2593 found = 1; 2594 } else if (memcmp(p + i, "PK\006\006", 4) == 0) { 2595 p += i; 2596 found = 1; 2597 } else 2598 i += 1; 2599 break; 2600 default: i += 4; break; 2601 } 2602 } 2603 __archive_read_consume(a, i); 2604 } 2605 correction = archive_filter_bytes(&a->archive, 0) 2606 - zip->central_directory_offset; 2607 2608 __archive_rb_tree_init(&zip->tree, &rb_ops); 2609 __archive_rb_tree_init(&zip->tree_rsrc, &rb_rsrc_ops); 2610 2611 zip->central_directory_entries_total = 0; 2612 while (1) { 2613 struct zip_entry *zip_entry; 2614 size_t filename_length, extra_length, comment_length; 2615 uint32_t external_attributes; 2616 const char *name, *r; 2617 2618 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL) 2619 return ARCHIVE_FATAL; 2620 if (memcmp(p, "PK\006\006", 4) == 0 2621 || memcmp(p, "PK\005\006", 4) == 0) { 2622 break; 2623 } else if (memcmp(p, "PK\001\002", 4) != 0) { 2624 archive_set_error(&a->archive, 2625 -1, "Invalid central directory signature"); 2626 return ARCHIVE_FATAL; 2627 } 2628 if ((p = __archive_read_ahead(a, 46, NULL)) == NULL) 2629 return ARCHIVE_FATAL; 2630 2631 zip_entry = calloc(1, sizeof(struct zip_entry)); 2632 zip_entry->next = zip->zip_entries; 2633 zip_entry->flags |= LA_FROM_CENTRAL_DIRECTORY; 2634 zip->zip_entries = zip_entry; 2635 zip->central_directory_entries_total++; 2636 2637 /* version = p[4]; */ 2638 zip_entry->system = p[5]; 2639 /* version_required = archive_le16dec(p + 6); */ 2640 zip_entry->zip_flags = archive_le16dec(p + 8); 2641 if (zip_entry->zip_flags 2642 & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)){ 2643 zip->has_encrypted_entries = 1; 2644 } 2645 zip_entry->compression = (char)archive_le16dec(p + 10); 2646 zip_entry->mtime = zip_time(p + 12); 2647 zip_entry->crc32 = archive_le32dec(p + 16); 2648 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END) 2649 zip_entry->decdat = p[13]; 2650 else 2651 zip_entry->decdat = p[19]; 2652 zip_entry->compressed_size = archive_le32dec(p + 20); 2653 zip_entry->uncompressed_size = archive_le32dec(p + 24); 2654 filename_length = archive_le16dec(p + 28); 2655 extra_length = archive_le16dec(p + 30); 2656 comment_length = archive_le16dec(p + 32); 2657 /* disk_start = archive_le16dec(p + 34); */ /* Better be zero. */ 2658 /* internal_attributes = archive_le16dec(p + 36); */ /* text bit */ 2659 external_attributes = archive_le32dec(p + 38); 2660 zip_entry->local_header_offset = 2661 archive_le32dec(p + 42) + correction; 2662 2663 /* If we can't guess the mode, leave it zero here; 2664 when we read the local file header we might get 2665 more information. */ 2666 if (zip_entry->system == 3) { 2667 zip_entry->mode = external_attributes >> 16; 2668 } else if (zip_entry->system == 0) { 2669 // Interpret MSDOS directory bit 2670 if (0x10 == (external_attributes & 0x10)) { 2671 zip_entry->mode = AE_IFDIR | 0775; 2672 } else { 2673 zip_entry->mode = AE_IFREG | 0664; 2674 } 2675 if (0x01 == (external_attributes & 0x01)) { 2676 // Read-only bit; strip write permissions 2677 zip_entry->mode &= 0555; 2678 } 2679 } else { 2680 zip_entry->mode = 0; 2681 } 2682 2683 /* We're done with the regular data; get the filename and 2684 * extra data. */ 2685 __archive_read_consume(a, 46); 2686 p = __archive_read_ahead(a, filename_length + extra_length, 2687 NULL); 2688 if (p == NULL) { 2689 archive_set_error(&a->archive, 2690 ARCHIVE_ERRNO_FILE_FORMAT, 2691 "Truncated ZIP file header"); 2692 return ARCHIVE_FATAL; 2693 } 2694 process_extra(p + filename_length, extra_length, zip_entry); 2695 2696 /* 2697 * Mac resource fork files are stored under the 2698 * "__MACOSX/" directory, so we should check if 2699 * it is. 2700 */ 2701 if (!zip->process_mac_extensions) { 2702 /* Treat every entry as a regular entry. */ 2703 __archive_rb_tree_insert_node(&zip->tree, 2704 &zip_entry->node); 2705 } else { 2706 name = p; 2707 r = rsrc_basename(name, filename_length); 2708 if (filename_length >= 9 && 2709 strncmp("__MACOSX/", name, 9) == 0) { 2710 /* If this file is not a resource fork nor 2711 * a directory. We should treat it as a non 2712 * resource fork file to expose it. */ 2713 if (name[filename_length-1] != '/' && 2714 (r - name < 3 || r[0] != '.' || r[1] != '_')) { 2715 __archive_rb_tree_insert_node( 2716 &zip->tree, &zip_entry->node); 2717 /* Expose its parent directories. */ 2718 expose_parent_dirs(zip, name, 2719 filename_length); 2720 } else { 2721 /* This file is a resource fork file or 2722 * a directory. */ 2723 archive_strncpy(&(zip_entry->rsrcname), 2724 name, filename_length); 2725 __archive_rb_tree_insert_node( 2726 &zip->tree_rsrc, &zip_entry->node); 2727 } 2728 } else { 2729 /* Generate resource fork name to find its 2730 * resource file at zip->tree_rsrc. */ 2731 archive_strcpy(&(zip_entry->rsrcname), 2732 "__MACOSX/"); 2733 archive_strncat(&(zip_entry->rsrcname), 2734 name, r - name); 2735 archive_strcat(&(zip_entry->rsrcname), "._"); 2736 archive_strncat(&(zip_entry->rsrcname), 2737 name + (r - name), 2738 filename_length - (r - name)); 2739 /* Register an entry to RB tree to sort it by 2740 * file offset. */ 2741 __archive_rb_tree_insert_node(&zip->tree, 2742 &zip_entry->node); 2743 } 2744 } 2745 2746 /* Skip the comment too ... */ 2747 __archive_read_consume(a, 2748 filename_length + extra_length + comment_length); 2749 } 2750 2751 return ARCHIVE_OK; 2752} 2753 2754static ssize_t 2755zip_get_local_file_header_size(struct archive_read *a, size_t extra) 2756{ 2757 const char *p; 2758 ssize_t filename_length, extra_length; 2759 2760 if ((p = __archive_read_ahead(a, extra + 30, NULL)) == NULL) { 2761 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2762 "Truncated ZIP file header"); 2763 return (ARCHIVE_WARN); 2764 } 2765 p += extra; 2766 2767 if (memcmp(p, "PK\003\004", 4) != 0) { 2768 archive_set_error(&a->archive, -1, "Damaged Zip archive"); 2769 return ARCHIVE_WARN; 2770 } 2771 filename_length = archive_le16dec(p + 26); 2772 extra_length = archive_le16dec(p + 28); 2773 2774 return (30 + filename_length + extra_length); 2775} 2776 2777static int 2778zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry, 2779 struct zip_entry *rsrc) 2780{ 2781 struct zip *zip = (struct zip *)a->format->data; 2782 unsigned char *metadata, *mp; 2783 int64_t offset = archive_filter_bytes(&a->archive, 0); 2784 size_t remaining_bytes, metadata_bytes; 2785 ssize_t hsize; 2786 int ret = ARCHIVE_OK, eof; 2787 2788 switch(rsrc->compression) { 2789 case 0: /* No compression. */ 2790 if (rsrc->uncompressed_size != rsrc->compressed_size) { 2791 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2792 "Malformed OS X metadata entry: inconsistent size"); 2793 return (ARCHIVE_FATAL); 2794 } 2795#ifdef HAVE_ZLIB_H 2796 case 8: /* Deflate compression. */ 2797#endif 2798 break; 2799 default: /* Unsupported compression. */ 2800 /* Return a warning. */ 2801 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2802 "Unsupported ZIP compression method (%s)", 2803 compression_name(rsrc->compression)); 2804 /* We can't decompress this entry, but we will 2805 * be able to skip() it and try the next entry. */ 2806 return (ARCHIVE_WARN); 2807 } 2808 2809 if (rsrc->uncompressed_size > (4 * 1024 * 1024)) { 2810 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2811 "Mac metadata is too large: %jd > 4M bytes", 2812 (intmax_t)rsrc->uncompressed_size); 2813 return (ARCHIVE_WARN); 2814 } 2815 if (rsrc->compressed_size > (4 * 1024 * 1024)) { 2816 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 2817 "Mac metadata is too large: %jd > 4M bytes", 2818 (intmax_t)rsrc->compressed_size); 2819 return (ARCHIVE_WARN); 2820 } 2821 2822 metadata = malloc((size_t)rsrc->uncompressed_size); 2823 if (metadata == NULL) { 2824 archive_set_error(&a->archive, ENOMEM, 2825 "Can't allocate memory for Mac metadata"); 2826 return (ARCHIVE_FATAL); 2827 } 2828 2829 if (offset < rsrc->local_header_offset) 2830 __archive_read_consume(a, rsrc->local_header_offset - offset); 2831 else if (offset != rsrc->local_header_offset) { 2832 __archive_read_seek(a, rsrc->local_header_offset, SEEK_SET); 2833 } 2834 2835 hsize = zip_get_local_file_header_size(a, 0); 2836 __archive_read_consume(a, hsize); 2837 2838 remaining_bytes = (size_t)rsrc->compressed_size; 2839 metadata_bytes = (size_t)rsrc->uncompressed_size; 2840 mp = metadata; 2841 eof = 0; 2842 while (!eof && remaining_bytes) { 2843 const unsigned char *p; 2844 ssize_t bytes_avail; 2845 size_t bytes_used; 2846 2847 p = __archive_read_ahead(a, 1, &bytes_avail); 2848 if (p == NULL) { 2849 archive_set_error(&a->archive, 2850 ARCHIVE_ERRNO_FILE_FORMAT, 2851 "Truncated ZIP file header"); 2852 ret = ARCHIVE_WARN; 2853 goto exit_mac_metadata; 2854 } 2855 if ((size_t)bytes_avail > remaining_bytes) 2856 bytes_avail = remaining_bytes; 2857 switch(rsrc->compression) { 2858 case 0: /* No compression. */ 2859 if ((size_t)bytes_avail > metadata_bytes) 2860 bytes_avail = metadata_bytes; 2861 memcpy(mp, p, bytes_avail); 2862 bytes_used = (size_t)bytes_avail; 2863 metadata_bytes -= bytes_used; 2864 mp += bytes_used; 2865 if (metadata_bytes == 0) 2866 eof = 1; 2867 break; 2868#ifdef HAVE_ZLIB_H 2869 case 8: /* Deflate compression. */ 2870 { 2871 int r; 2872 2873 ret = zip_deflate_init(a, zip); 2874 if (ret != ARCHIVE_OK) 2875 goto exit_mac_metadata; 2876 zip->stream.next_in = 2877 (Bytef *)(uintptr_t)(const void *)p; 2878 zip->stream.avail_in = (uInt)bytes_avail; 2879 zip->stream.total_in = 0; 2880 zip->stream.next_out = mp; 2881 zip->stream.avail_out = (uInt)metadata_bytes; 2882 zip->stream.total_out = 0; 2883 2884 r = inflate(&zip->stream, 0); 2885 switch (r) { 2886 case Z_OK: 2887 break; 2888 case Z_STREAM_END: 2889 eof = 1; 2890 break; 2891 case Z_MEM_ERROR: 2892 archive_set_error(&a->archive, ENOMEM, 2893 "Out of memory for ZIP decompression"); 2894 ret = ARCHIVE_FATAL; 2895 goto exit_mac_metadata; 2896 default: 2897 archive_set_error(&a->archive, 2898 ARCHIVE_ERRNO_MISC, 2899 "ZIP decompression failed (%d)", r); 2900 ret = ARCHIVE_FATAL; 2901 goto exit_mac_metadata; 2902 } 2903 bytes_used = zip->stream.total_in; 2904 metadata_bytes -= zip->stream.total_out; 2905 mp += zip->stream.total_out; 2906 break; 2907 } 2908#endif 2909 default: 2910 bytes_used = 0; 2911 break; 2912 } 2913 __archive_read_consume(a, bytes_used); 2914 remaining_bytes -= bytes_used; 2915 } 2916 archive_entry_copy_mac_metadata(entry, metadata, 2917 (size_t)rsrc->uncompressed_size - metadata_bytes); 2918 2919exit_mac_metadata: 2920 __archive_read_seek(a, offset, SEEK_SET); 2921 zip->decompress_init = 0; 2922 free(metadata); 2923 return (ret); 2924} 2925 2926static int 2927archive_read_format_zip_seekable_read_header(struct archive_read *a, 2928 struct archive_entry *entry) 2929{ 2930 struct zip *zip = (struct zip *)a->format->data; 2931 struct zip_entry *rsrc; 2932 int64_t offset; 2933 int r, ret = ARCHIVE_OK; 2934 2935 /* 2936 * It should be sufficient to call archive_read_next_header() for 2937 * a reader to determine if an entry is encrypted or not. If the 2938 * encryption of an entry is only detectable when calling 2939 * archive_read_data(), so be it. We'll do the same check there 2940 * as well. 2941 */ 2942 if (zip->has_encrypted_entries == 2943 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) 2944 zip->has_encrypted_entries = 0; 2945 2946 a->archive.archive_format = ARCHIVE_FORMAT_ZIP; 2947 if (a->archive.archive_format_name == NULL) 2948 a->archive.archive_format_name = "ZIP"; 2949 2950 if (zip->zip_entries == NULL) { 2951 r = slurp_central_directory(a, zip); 2952 if (r != ARCHIVE_OK) 2953 return r; 2954 /* Get first entry whose local header offset is lower than 2955 * other entries in the archive file. */ 2956 zip->entry = 2957 (struct zip_entry *)ARCHIVE_RB_TREE_MIN(&zip->tree); 2958 } else if (zip->entry != NULL) { 2959 /* Get next entry in local header offset order. */ 2960 zip->entry = (struct zip_entry *)__archive_rb_tree_iterate( 2961 &zip->tree, &zip->entry->node, ARCHIVE_RB_DIR_RIGHT); 2962 } 2963 2964 if (zip->entry == NULL) 2965 return ARCHIVE_EOF; 2966 2967 if (zip->entry->rsrcname.s) 2968 rsrc = (struct zip_entry *)__archive_rb_tree_find_node( 2969 &zip->tree_rsrc, zip->entry->rsrcname.s); 2970 else 2971 rsrc = NULL; 2972 2973 if (zip->cctx_valid) 2974 archive_decrypto_aes_ctr_release(&zip->cctx); 2975 if (zip->hctx_valid) 2976 archive_hmac_sha1_cleanup(&zip->hctx); 2977 zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0; 2978 __archive_read_reset_passphrase(a); 2979 2980 /* File entries are sorted by the header offset, we should mostly 2981 * use __archive_read_consume to advance a read point to avoid redundant 2982 * data reading. */ 2983 offset = archive_filter_bytes(&a->archive, 0); 2984 if (offset < zip->entry->local_header_offset) 2985 __archive_read_consume(a, 2986 zip->entry->local_header_offset - offset); 2987 else if (offset != zip->entry->local_header_offset) { 2988 __archive_read_seek(a, zip->entry->local_header_offset, 2989 SEEK_SET); 2990 } 2991 zip->unconsumed = 0; 2992 r = zip_read_local_file_header(a, entry, zip); 2993 if (r != ARCHIVE_OK) 2994 return r; 2995 if (rsrc) { 2996 int ret2 = zip_read_mac_metadata(a, entry, rsrc); 2997 if (ret2 < ret) 2998 ret = ret2; 2999 } 3000 return (ret); 3001} 3002 3003/* 3004 * We're going to seek for the next header anyway, so we don't 3005 * need to bother doing anything here. 3006 */ 3007static int 3008archive_read_format_zip_read_data_skip_seekable(struct archive_read *a) 3009{ 3010 struct zip *zip; 3011 zip = (struct zip *)(a->format->data); 3012 3013 zip->unconsumed = 0; 3014 return (ARCHIVE_OK); 3015} 3016 3017int 3018archive_read_support_format_zip_seekable(struct archive *_a) 3019{ 3020 struct archive_read *a = (struct archive_read *)_a; 3021 struct zip *zip; 3022 int r; 3023 3024 archive_check_magic(_a, ARCHIVE_READ_MAGIC, 3025 ARCHIVE_STATE_NEW, "archive_read_support_format_zip_seekable"); 3026 3027 zip = (struct zip *)calloc(1, sizeof(*zip)); 3028 if (zip == NULL) { 3029 archive_set_error(&a->archive, ENOMEM, 3030 "Can't allocate zip data"); 3031 return (ARCHIVE_FATAL); 3032 } 3033 3034#ifdef HAVE_COPYFILE_H 3035 /* Set this by default on Mac OS. */ 3036 zip->process_mac_extensions = 1; 3037#endif 3038 3039 /* 3040 * Until enough data has been read, we cannot tell about 3041 * any encrypted entries yet. 3042 */ 3043 zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; 3044 zip->crc32func = real_crc32; 3045 3046 r = __archive_read_register_format(a, 3047 zip, 3048 "zip", 3049 archive_read_format_zip_seekable_bid, 3050 archive_read_format_zip_options, 3051 archive_read_format_zip_seekable_read_header, 3052 archive_read_format_zip_read_data, 3053 archive_read_format_zip_read_data_skip_seekable, 3054 NULL, 3055 archive_read_format_zip_cleanup, 3056 archive_read_support_format_zip_capabilities_seekable, 3057 archive_read_format_zip_has_encrypted_entries); 3058 3059 if (r != ARCHIVE_OK) 3060 free(zip); 3061 return (ARCHIVE_OK); 3062} 3063